Configure release signing key mechanism and ignore keystore files in .gitignore

android/app/build.gradle

@@ -104,6 +104,14 @@ android {
             keyAlias 'androiddebugkey'
             keyPassword 'android'
         }
+        release {
+            if (project.hasProperty('SCHNAPPIX_RELEASE_STORE_FILE')) {
+                storeFile file(SCHNAPPIX_RELEASE_STORE_FILE)
+                storePassword SCHNAPPIX_RELEASE_STORE_PASSWORD
+                keyAlias SCHNAPPIX_RELEASE_KEY_ALIAS
+                keyPassword SCHNAPPIX_RELEASE_KEY_PASSWORD
+            }
+        }
     }
     buildTypes {
         debug {
@@ -112,7 +120,11 @@ android {
         release {
             // Caution! In production, you need to generate your own keystore file.
             // see https://reactnative.dev/docs/signed-apk-android.
+            if (project.hasProperty('SCHNAPPIX_RELEASE_STORE_FILE')) {
+                signingConfig signingConfigs.release
+            } else {
                 signingConfig signingConfigs.debug
+            }
             def enableShrinkResources = findProperty('android.enableShrinkResourcesInReleaseBuilds') ?: 'false'
             shrinkResources enableShrinkResources.toBoolean()
             minifyEnabled enableMinifyInReleaseBuilds