Previously :latest tracked the tip of main, which meant pulling :latest
got you whatever was last merged — fine for development, surprising for
users who expect :latest to mean 'the most recent stable release'.
Reshape the publish flow so the floating tags carry their conventional
meaning:
- :sha-<sha> every main commit (unchanged, immutable)
- :main tip of main (NEW; what :latest used to do)
- :<release_tag> every published release, e.g. :v1.2.3 (unchanged)
- :latest most recent release (CHANGED; release-only now)
Implementation:
- Rename the move-latest job to move-main; it still gates on push to
main, still ancestor-checks the existing :main label before
retagging, still uses cancel-in-progress: false so queued moves run
serially.
- Add a new move-latest job gated on release: published. Reads the
OCI revision label off the existing :latest and only advances if
the release commit is a strict descendant. This keeps backport
releases on older branches (e.g. patching v1.1.5 after v1.2.3 has
already shipped) from dragging :latest backwards.
- merge job exposes pushed_release_tag and release_tag outputs so
move-latest knows when to fire and what to retag from.
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