## Summary The Firebase Test Lab job (issue #549) failed because `flutter build apk --debug --no-pub` spawned a Gradle daemon, whose journal-cache lock file was left on the persistent Dagger `gradle-cache` mount after the `WithExec` container was torn down. The next exec, `./gradlew --no-daemon app:assembleAndroidTest`, then timed out after 60s waiting for that stale lock: ``` > Timeout waiting to lock journal cache (/home/ci/.gradle/caches/journal-1). It is currently in use by another process. Owner PID: 88 Our PID: 53 ``` The pre-existing `--no-daemon` only prevented stale daemon-registry reuse, not stale lock files. **Fix:** chain `./gradlew --stop` into the first `WithExec` so the daemon shuts down gracefully and releases its locks before Dagger snapshots the layer. ## Test plan - [ ] CI passes - [ ] Manually re-run the Firebase Tests workflow (`workflow_dispatch`) and confirm the Gradle journal-lock error no longer appears Closes #549 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-authored-by: Till Düßmann (Claude agent) <tilldu@googlemail.com> Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/554