ci: cancel superseded PR runs instead of building twice - #5
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Pushing a follow-up commit to an open PR left the previous run building both images to completion, so a branch could have two multi-GB builds in flight at once whose older result is discarded on arrival. Only the newest commit's result gates the merge, so the older run is cancelled. Scoped per PR, so runs on different PRs never cancel each other. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Pull request overview
Adds GitHub Actions concurrency control to the CI workflow so that when new commits are pushed to an open PR, any older in-progress CI run for that same PR is automatically canceled. This reduces wasted time and runner/storage usage from redundant multi-GB image builds while preserving PR-level isolation (different PRs don’t cancel each other).
Changes:
- Introduces a
concurrencygroup keyed by PR number (with a fallback togithub.ref) for the CI workflow. - Enables
cancel-in-progress: trueto cancel superseded runs automatically. - Documents the rationale inline in the workflow file.
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🐳 PR images built (amd64 only):
To test, point a devcontainer.json |
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Pushing a follow-up commit to an open PR left the previous run building both images to completion, so a branch could have two multi-GB builds in flight at once whose older result is discarded on arrival.
Only the newest commit's result gates the merge, so the older run is cancelled. Scoped per PR, so runs on different PRs never cancel each other.