fix(cargo): apply the network config in the Daytona build and harden the test

Copy the repository .cargo directory into the Daytona runner Docker
build stage, so the production cargo build picks up the raised retry
count and transfer timeout instead of the cargo defaults. Add .cargo
to the audited Daytona image input paths, so a future change to that
file invalidates the cached image.

Make Arm B of the network stall differential harness unset
CARGO_NET_RETRY and CARGO_HTTP_TIMEOUT before it runs cargo fetch, so
the harness tests the repository config instead of a value the caller
happens to have exported.

Correct the .cargo/config.toml comment: the retry count rises from
Cargo's default of 3 to 5, which is two more retries, not one.

Co-authored-by: Paperclip <noreply@paperclip.ing>

.cargo/config.toml

@@ -2,7 +2,7 @@
 # below 10 bytes per second for 30 seconds, then retry 3 times. On a
 # shared CI runner a brief network stall can cross that 30-second window
 # on every attempt, so the whole download fails even though the network
-# recovers soon after. A wider timeout and one more retry give a stall
+# recovers soon after. A wider timeout and two more retries give a stall
 # more time to pass before cargo gives up.
 #
 # Worst case for one dead crate: 6 attempts (1 try plus 5 retries) times

docker/daytona-runner/Dockerfile

@@ -6,6 +6,7 @@
 FROM rust:1.97-bookworm@sha256:408fe88047cef61a2087653b0c5255fa51c0f2d6d94ddedd7a2562a9b91a46f6 AS runnerd-build
 
 WORKDIR /workspace/packages/paperclip-runner/runner
+COPY .cargo /workspace/.cargo
 COPY packages/paperclip-runner/runner/Cargo.toml packages/paperclip-runner/runner/Cargo.lock ./
 COPY packages/paperclip-runner/runner/crates ./crates
 COPY packages/paperclip-runner/protocol ../protocol

scripts/cargo-network-stall-harness/run-differential.sh

@@ -106,7 +106,7 @@ echo "$ARM_A_OUTPUT"
 echo "Arm A exit status: $ARM_A_STATUS"
 
 set +e
-ARM_B_OUTPUT="$(run_arm B env 2>&1)"
+ARM_B_OUTPUT="$(run_arm B env -u CARGO_NET_RETRY -u CARGO_HTTP_TIMEOUT 2>&1)"
 ARM_B_STATUS=$?
 set -e
 echo "$ARM_B_OUTPUT"

tests/runner-e2e/daytona-image-content.ts

@@ -14,6 +14,7 @@ export const DAYTONA_IMAGE_DOCKERFILE_PATH = "docker/daytona-runner/Dockerfile";
 // Keep it conservative: a false positive only rebuilds the image, while a
 // missing input could incorrectly reuse an incompatible paid-test image.
 export const DAYTONA_IMAGE_INPUT_PATHS = [
+  ".cargo",
   ".dockerignore",
   ".npmrc",
   "docker/daytona-runner/Dockerfile",