Notify on merge queue failures#576
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The action previously skipped silently when no previous workflow runs were found on main. This prevented merge queue failures from triggering notifications, since merge queue runs land on ephemeral refs and never appear in a main-branch run query. Now: no history + failed → fire failure notification; no history + passed → skip. State-transition logic is unchanged for builds with history.
Extend `bakery ci matrix` with a `--latest` flag that mirrors the flag already on `bakery build`. For regular versions it keeps only those with `latest: true`; for matrix images it keeps only the highest-version combination (the row where `ImageVersion.latest` is set by `_matches_latest`). Add a `latest-only` boolean input to `bakery-build-pr.yml` that passes `--latest` to the matrix generation steps, so calling workflows can opt individual event types into a faster subset run. Add a `multiversion` test context and BDD scenarios that verify the flag filters non-latest versions from the output.
bschwedler
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latest-only is not yet available in bakery-build-pr.yml@main. Revert this commit and squash with the previous one once posit-dev/images-shared#576 is merged.
bschwedler
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Points bakery-build-pr.yml at feat/merge-queue-slack-notifications so latest-only can be tested before images-shared#576 merges. Once posit-dev/images-shared#576 is merged, drop this commit and restore @main refs in the previous commit.
bschwedler
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Jun 8, 2026
Points bakery-build-pr.yml and setup-bakery (via version:) at feat/merge-queue-slack-notifications so latest-only can be tested before images-shared#576 merges. Once posit-dev/images-shared#576 is merged, drop this commit and restore @main refs in the previous commit.
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The Slack notification action previously skipped silently when no prior
run history was found. Merge queue runs on ephemeral refs never appear
in a main-branch run query, so that guard was swallowing all merge queue
failures with no notification.
Now: no history + passing → still skip. No history + failing → notify.