PaperClipAI/.github/workflows/docker.yml

name: Docker

on:
  push:
    branches:
      - "master"
    tags:
      - "v*"
      - "nightly/v*"
      - "beta/v*"
  # Release workflows push lane tags with GITHUB_TOKEN, and GitHub suppresses
  # push-triggered runs for those, so release.yml dispatches this workflow at
  # the new tag ref instead. The tag mapping below keys off github.ref either
  # way.
  workflow_dispatch:

# Least privilege: nothing at the workflow level; each job declares exactly
# the token scopes it uses (checkout needs contents:read, GHCR pushes need
# packages:write).
permissions: {}

# Serialise builds per ref without killing an in-flight one: a newer push
# supersedes only the pending slot, so the image build that is already
# running always finishes and publishes. Canary TAG refs each get their
# own group on purpose: their builds run in parallel so every published
# canary gets its sha images regardless of merge cadence. The mutable
# `:canary` channel tags are NOT written by the build matrix (which
# would race across parallel runs) — each canary-tag run retags the
# channel afterwards, only if it still matches the npm `canary`
# dist-tag, so the channel moves monotonically and always mirrors npm.
concurrency:
  group: docker-${{ github.ref }}
  cancel-in-progress: false

jobs:
  source_verification:
    name: Watch exact-source verification
    if: github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master'
    runs-on: ${{ vars.AWS_POST_MERGE_CI_ENABLED == 'true' && github.run_attempt >= 1 && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && 'runs-on/fleet=paperclip-post-merge-x64/env=public-ci' || 'ubuntu-latest' }}
    timeout-minutes: 44
    permissions:
      contents: read
      actions: write
    outputs:
      verified: ${{ steps.watch.outputs.verified }}
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
        with:
          persist-credentials: false
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: 24
      - name: Stop images when source checks fail and report runner waits
        id: watch
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: node scripts/watch-release-source.mjs

  reuse_canary_image:
    if: github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && startsWith(github.ref, 'refs/tags/canary/v')
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
      packages: write
      attestations: read
    outputs:
      reused: ${{ steps.reuse.outputs.reused }}
    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
      - name: Setup Node.js
        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: 24
      - name: Login to GitHub Container Registry
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Reuse the verified master image when present
        id: reuse
        env:
          GH_TOKEN: ${{ github.token }}
        run: node scripts/reuse-canary-image.mjs

  # Multi-arch by native runner, not QEMU.
  #
  # This was one job building linux/amd64,linux/arm64 together on an x86
  # runner. The arm64 half is emulated there, and it did not merely run slow:
  # it wedged, every time, in `RUN pnpm --filter @paperclipai/server build`,
  # emitting nothing for 38-45 minutes until `timeout-minutes: 60` killed the
  # job. Verified across three consecutive runs on 2026-09-04; the amd64 half
  # reached `production 5/5` minutes earlier in every one.
  #
  # A timed-out job is reported as *cancelled*, not failed, so the run read
  # "cancelled" and the production image simply stopped publishing without
  # anything going red in an obvious way.
  #
  # It also starved the queue. A run that burns the full hour holds the
  # top-level concurrency slot for that hour, and `cancel-in-progress: false`
  # keeps exactly one pending slot — so with merges arriving faster than one
  # an hour, most runs were superseded before they ever started a job. Five of
  # ten master commits sampled that day never produced an image at all.
  #
  # Each platform now builds on a runner of its own architecture and pushes by
  # digest; `merge` assembles the manifest list. Both architectures remain
  # available to self-hosted installations and downstream image composers.
  build-and-push:
    needs: [reuse_canary_image]
    if: ${{ !cancelled() && (needs.reuse_canary_image.result == 'skipped' || (needs.reuse_canary_image.result == 'success' && needs.reuse_canary_image.outputs.reused == 'false')) }}
    strategy:
      # Independent legs: one architecture failing should still publish
      # nothing, but it must not also hide the other's logs behind a
      # cancellation.
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
            arch: amd64
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
            arch: arm64
    runs-on: ${{ vars.CORE_RELEASE_AWS_ENABLED == 'true' && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && format('runs-on/fleet=paperclip-core-image-{0}/env=public-ci', matrix.arch == 'amd64' && 'x64' || 'arm64') || matrix.runner }}
    # Stop before the AWS worker's 45-minute maximum lifetime. Hosted tag
    # builds retain their existing limit.
    timeout-minutes: ${{ vars.CORE_RELEASE_AWS_ENABLED == 'true' && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && 40 || 60 }}
    permissions:
      contents: read
      packages: write
    steps:
      - name: Checkout
        uses: actions/checkout@v7
        with:
          # Full history and tags so `git describe` below can compute the
          # release version to stamp into the image.
          fetch-depth: 0
          # Keep the version's full commit graph without downloading blobs
          # from every historical revision of this large repository.
          filter: blob:none

      # `.git` is dockerignored, so a running image cannot derive its own
      # version and otherwise reports the source package.json placeholder in
      # analytics and the debug panel. Compute it here from the pristine
      # checkout (real CalVer drift from the nearest release tag) and pass it
      # into both builds. Empty when no release tag is reachable — the server
      # then keeps its existing fallbacks.
      - name: Compute build version
        id: build-version
        run: |
          set -euo pipefail
          case "${GITHUB_REF}" in
            refs/tags/nightly/v*)
              # Lane tags carry the exact published version; stamp it verbatim
              # instead of describing drift from the nearest stable tag.
              version="${GITHUB_REF#refs/tags/nightly/v}"
              ;;
            refs/tags/beta/v*)
              version="${GITHUB_REF#refs/tags/beta/v}"
              ;;
            *)
              version="$(git describe --tags --match 'v*' --long --dirty 2>/dev/null || true)"
              ;;
          esac
          echo "version=${version}" >> "$GITHUB_OUTPUT"
          echo "Stamping build version: ${version:-<none>}"

      # ISO week stamp for the Dockerfile's tool layer: the layer caches
      # across commits and re-pulls the @latest CLI tools when the week rolls
      # over, instead of on every build.
      - name: Compute tool cache epoch
        id: tools-epoch
        run: echo "epoch=$(date -u +%G-W%V)" >> "$GITHUB_OUTPUT"

      - name: Setup pnpm
        uses: pnpm/action-setup@v6
        with:
          version: 9.15.4
          run_install: false

      # No dependency cache here: this workflow publishes release images, and
      # restoring a shared Actions cache into the build inputs would let a
      # poisoned cache entry reach the published artifact.
      - name: Setup Node.js
        uses: actions/setup-node@v7
        with:
          node-version: 24

      - name: Refresh lockfile for Docker build context
        run: |
          set -euo pipefail
          pnpm install --resolution-only --ignore-scripts --no-frozen-lockfile

          changed="$(git status --porcelain)"
          if [ -z "$changed" ]; then
            echo "Lockfile already matches package metadata."
            exit 0
          fi

          if printf '%s\n' "$changed" | grep -Fvq ' pnpm-lock.yaml'; then
            echo "Unexpected files changed during lockfile refresh:"
            echo "$changed"
            exit 1
          fi

          echo "Using refreshed pnpm-lock.yaml in the Docker build context."

      - name: Free runner disk
        if: ${{ !(vars.CORE_RELEASE_AWS_ENABLED == 'true' && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master') }}
        run: |
          set -euo pipefail
          echo "Disk before cleanup:"
          df -h

          pnpm store prune || true
          sudo apt-get clean || true
          sudo rm -rf \
            /usr/share/dotnet \
            /usr/share/swift \
            /usr/local/lib/android \
            /usr/local/share/boost \
            /usr/local/share/powershell \
            /opt/ghc \
            /opt/hostedtoolcache/CodeQL \
            /opt/hostedtoolcache/PyPy \
            /opt/hostedtoolcache/Ruby || true
          docker system prune -af || true

          echo "Disk after cleanup:"
          df -h

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4
        with:
          buildkitd-config-inline: |
            [registry."docker.io"]
              mirrors = ["mirror.gcr.io"]

      # Deployment tooling reads these labels from the registry to verify an
      # image's schema expectations against a migrator before deploying it,
      # without pulling the image. The server refuses to start when the
      # database is missing bundled migrations, so orchestrators need a cheap
      # way to check image/migrator compatibility up front.
      - name: Compute schema migration labels
        id: schema
        run: |
          set -euo pipefail
          last=$(ls packages/db/src/migrations/*.sql | sed 's|.*/||' | LC_ALL=C sort | tail -1)
          count=$(ls packages/db/src/migrations/*.sql | wc -l | tr -d ' ')
          echo "last=${last}" >> "$GITHUB_OUTPUT"
          echo "count=${count}" >> "$GITHUB_OUTPUT"

      # Lane tag mapping: nightly/v* tags publish `:nightly`, and only
      # stable v* tags move `:latest` and the versioned tags.
      # `:sha-<short>` is published on every build. `:canary` is
      # deliberately absent here — the channel tag is moved by the
      # dist-tag-checked retag step below, never by the build matrix,
      # so parallel canary builds cannot race it backwards.
      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=nightly,enable=${{ startsWith(github.ref, 'refs/tags/nightly/v') }}
            type=raw,value=beta,enable=${{ startsWith(github.ref, 'refs/tags/beta/v') }}
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=semver,pattern={{version}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=semver,pattern={{major}}.{{minor}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=sha
            type=raw,value=sha-${{ github.sha }},enable=${{ github.repository == 'paperclipai/paperclip' && github.event_name == 'push' && github.ref == 'refs/heads/master' }}
          labels: |
            io.github.paperclipai.schema.last-migration=${{ steps.schema.outputs.last }}
            io.github.paperclipai.schema.migration-count=${{ steps.schema.outputs.count }}
      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v7
        with:
          context: .
          # Pin the self-hosted image to the production stage explicitly:
          # the Dockerfile now declares a later `cloud` stage, and without a
          # target the default would silently become that stage.
          target: production
          build-args: |
            PAPERCLIP_BUILD_VERSION=${{ steps.build-version.outputs.version }}
            PAPERCLIP_BUILD_COMMIT=${{ github.sha }}
            CLI_TOOLS_CACHE_EPOCH=${{ steps.tools-epoch.outputs.epoch }}
          platforms: ${{ matrix.platform }}
          # By digest, not by tag: two runners cannot each push the same tag
          # and end up with a manifest list. Each leg publishes an untagged
          # image and `merge` names them together.
          outputs: type=image,name=ghcr.io/${{ github.repository }},push-by-digest=true,name-canonical=true,push=true
          # Registry-backed BuildKit cache instead of type=gha: the Actions
          # cache is capped at 10GB per repo, and two multi-arch mode=max jobs
          # evict each other, so most builds ran effectively cold. The cache
          # ref lives in ghcr next to the image and is written only by this
          # workflow (docker.yml runs on master/tag pushes, never on PRs).
          #
          # Per-arch refs now the legs are separate runners: a shared ref would
          # have each leg overwrite the other's cache on every build.
          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache-${{ matrix.arch }}
          cache-to: type=registry,ref=ghcr.io/${{ github.repository }}:buildcache-${{ matrix.arch }},mode=max
          labels: ${{ steps.meta.outputs.labels }}

      # PID 1 must be an init that reaps adopted orphans. With node there, the
      # orphans agent runs leave behind are never wait()ed and pin as zombies
      # until the cgroup pid limit is exhausted and every fork() in the
      # container fails.
      #
      # Probed here, on this leg's own architecture, against the exact digest
      # just pushed. On master this runs while the exact-source gate is still
      # pending, so the image pull (~95 s for amd64) is off the publication
      # path, and arm64 is exercised too (the publisher runner is x86_64 only).
      # Only a probed digest is exported, and merge-and-push signs an index
      # only when its every Linux image is one of these probed digests.
      - name: Verify PID 1 reaps orphaned processes
        env:
          # Through the environment, not interpolated into the script body.
          IMAGE_DIGEST: ${{ steps.build.outputs.digest }}
          IMAGE_NAME: ghcr.io/${{ github.repository }}
          PLATFORM: ${{ matrix.platform }}
        run: |
          set -euo pipefail
          test -n "$IMAGE_DIGEST"
          echo "Verifying orphan reaping in $IMAGE_NAME@$IMAGE_DIGEST ($PLATFORM)"
          docker run --rm -i --pull always --platform "$PLATFORM" "$IMAGE_NAME@$IMAGE_DIGEST" sh -s < scripts/assert-orphan-reaping.sh

      # The digest is the only thing `merge` needs from this job. Carried as an
      # empty file named for it, which is the upstream pattern — the name is
      # the payload, so several legs can upload without colliding on content.
      - name: Export digest
        run: |
          set -euo pipefail
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          test -n "$digest"
          touch "/tmp/digests/${digest#sha256:}"

      - name: Upload digest
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: digests-production-${{ matrix.arch }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  # Wait for proof on ephemeral verification capacity. Publication runners do
  # only registry/signing work. Each Spot observer stays below its 45m lifetime.
  publication_verification:
    name: Require exact-source verification
    if: ${{ !cancelled() && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && needs.build-and-push.result == 'success' && needs.source_verification.result == 'success' && needs.source_verification.outputs.verified != 'true' }}
    needs: [build-and-push, source_verification]
    runs-on: ${{ vars.AWS_POST_MERGE_CI_ENABLED == 'true' && github.run_attempt >= 1 && github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && 'runs-on/fleet=paperclip-post-merge-x64/env=public-ci' || 'ubuntu-latest' }}
    timeout-minutes: 44
    permissions:
      contents: read
      actions: write # restart only exact-source producers deferred before admission
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1
        with:
          persist-credentials: false
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: 24
      - name: Require source proof and migrator admission before publication
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: node scripts/watch-release-source.mjs --require-proof

  # Names the per-architecture digests as one manifest list under the real
  # tags. Nothing is publicly tagged until this runs, so a half-published
  # multi-arch image is not a state anything can pull.
  merge-and-push:
    if: ${{ !cancelled() && needs.build-and-push.result == 'success' && (needs.source_verification.result == 'success' || needs.source_verification.result == 'skipped') && (needs.publication_verification.result == 'success' || (needs.publication_verification.result == 'skipped' && (github.repository != 'paperclipai/paperclip' || github.repository_id != '1170821064' || github.ref != 'refs/heads/master' || needs.source_verification.outputs.verified == 'true'))) }}
    needs: [build-and-push, source_verification, publication_verification]
    runs-on: ${{ github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master' && (vars.CORE_PUBLICATION_RUNNER || 'cloud-release-32') || 'ubuntu-latest' }}
    timeout-minutes: 20
    permissions:
      contents: read
      actions: read
      packages: write
      id-token: write
      attestations: write
    steps:
      # Checked out for `packages/db` (schema labels) and the source-proof and
      # standard-image contract scripts.
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7

      - name: Download digests
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          path: /tmp/digests
          pattern: digests-production-*
          merge-multiple: true

      - name: Login to GitHub Container Registry
        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@37fe631027851001ddb9b187196cc803df7f5f0e # v4

      # Repeated from the build job rather than passed between them: job
      # outputs would have to survive a matrix, and this is two `ls` calls.
      - name: Compute schema migration labels
        id: schema
        run: |
          set -euo pipefail
          last=$(ls packages/db/src/migrations/*.sql | sed 's|.*/||' | LC_ALL=C sort | tail -1)
          count=$(ls packages/db/src/migrations/*.sql | wc -l | tr -d ' ')
          echo "last=${last}" >> "$GITHUB_OUTPUT"
          echo "count=${count}" >> "$GITHUB_OUTPUT"

      # Same lane mapping as the build job; this is where it is actually
      # applied, since the legs push untagged. `:canary` is deliberately
      # absent, exactly as in the build job's mapping: the channel tag is
      # moved only by the dist-tag-checked promote_canary_channel job below,
      # so parallel canary-tag builds can never race the channel backwards.
      - name: Docker meta
        id: meta
        uses: docker/metadata-action@dc802804100637a589fabce1cb79ff13a1411302 # v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=nightly,enable=${{ startsWith(github.ref, 'refs/tags/nightly/v') }}
            type=raw,value=beta,enable=${{ startsWith(github.ref, 'refs/tags/beta/v') }}
            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=semver,pattern={{version}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=semver,pattern={{major}}.{{minor}},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
            type=sha
            type=raw,value=sha-${{ github.sha }},enable=${{ github.repository == 'paperclipai/paperclip' && github.event_name == 'push' && github.ref == 'refs/heads/master' }}
          labels: |
            io.github.paperclipai.schema.last-migration=${{ steps.schema.outputs.last }}
            io.github.paperclipai.schema.migration-count=${{ steps.schema.outputs.count }}

      - name: Setup Node.js
        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020
        with:
          node-version: 24

      # Revalidate the latest attempt after runner assignment without waiting
      # here. A concurrent source retry must invalidate the earlier proof.
      - name: Revalidate exact-source proof before publication
        if: github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.ref == 'refs/heads/master'
        env:
          GITHUB_TOKEN: ${{ github.token }}
        run: node scripts/watch-release-source.mjs --check-proof

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          set -euo pipefail
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf 'ghcr.io/${{ github.repository }}@sha256:%s ' *)

      # The orphan-reaping probe ran in each build leg against the digest that
      # leg pushed; /tmp/digests holds only probed digests. Pulling the image
      # again here cost ~95 s after the source gate, on the publication path.

      # This generic contract is useful to any downstream image composer. Only
      # canonical master pushes own the full-SHA tag and its signed provenance.
      # Capture exact registry bytes and sign that digest, so later tag movement
      # cannot change what was verified. Registry content is addressed by
      # digest: the resolve step fails unless every Linux image in the index is
      # one the build legs probed.
      - name: Resolve standard image digest
        id: standard
        if: github.repository == 'paperclipai/paperclip' && github.repository_id == '1170821064' && github.event_name == 'push' && github.ref == 'refs/heads/master'
        run: node scripts/standard-image-contract.mjs --resolve "$GITHUB_SHA" --verified-digests /tmp/digests
      - name: Attest the standard production image
        if: steps.standard.outputs.digest != ''
        uses: actions/attest@1e69f48acb82d1966a394da916b4c1698aa569d6 # v4
        with:
          subject-name: ghcr.io/paperclipai/paperclip
          subject-digest: ${{ steps.standard.outputs.digest }}
          push-to-registry: true

  # Moves the mutable `:canary` channel tag. Kept OUT
  # of the build jobs and serialized in its own lane, and — the load-
  # bearing property — CONVERGENT rather than self-interested: a
  # promotion does not promote "its own" canary, it retags the channel
  # to whatever the npm `canary` dist-tag names at execution time,
  # provided that version's sha images are published. GitHub's shared
  # concurrency lane keeps one running and one pending promotion and
  # REPLACES the pending slot with the latest enqueued — an older build
  # finishing late can therefore evict the newest canary's pending
  # promotion. With convergent promotion that eviction is harmless:
  # whichever promotion survives resolves the current dist-tag fresh
  # and lands the channel there (the current canary's images always
  # exist by the time any later promotion runs, because per-tag build
  # groups mean canary builds are never superseded and each run's
  # promotion is gated on its own completed pushes). Every interleaving
  # converges the Docker channel onto the npm channel.
  promote_canary_channel:
    if: ${{ !cancelled() && startsWith(github.ref, 'refs/tags/canary/v') && (needs.merge-and-push.result == 'success' || (needs.reuse_canary_image.result == 'success' && needs.reuse_canary_image.outputs.reused == 'true')) }}
    needs: [reuse_canary_image, merge-and-push]
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: read
      packages: write
    concurrency:
      group: docker-canary-channel-promotion
      cancel-in-progress: false
    steps:
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Converge the channel tags onto the current npm canary
        env:
          IMAGE: ghcr.io/${{ github.repository }}
          GH_TOKEN: ${{ github.token }}
        run: |
          current="$(curl -fsS "https://registry.npmjs.org/-/package/@paperclipai%2Fdb/dist-tags" | jq -er .canary)"
          sha="$(gh api "repos/${GITHUB_REPOSITORY}/commits/$(printf 'canary/v%s' "$current" | jq -sRr @uri)" --jq .sha 2>/dev/null || true)"
          if [ -z "$sha" ]; then
            echo "canary/v${current} does not resolve yet; a later promotion converges the channel"
            exit 0
          fi
          short="$(printf '%s' "$sha" | cut -c1-7)"
          if ! docker buildx imagetools inspect "$IMAGE:sha-${short}" >/dev/null 2>&1; then
            echo "images for ${current} (sha-${short}) not published yet; its own promotion converges the channel"
            exit 0
          fi
          docker buildx imagetools create -t "$IMAGE:canary" "$IMAGE:sha-${short}"
          echo "channel tags moved to canary ${current} (sha-${short})"