Switch top-level concurrency to cancel-in-progress=false so every push
to main gets its own SHA-tagged image published — no more discarded
builds when commits land back-to-back.
Guard the :latest tag with a second job that has its own concurrency
group with cancel-in-progress=true plus a git-ancestor check against
the revision label on the current :latest. Together these guarantee
:latest only ever moves forward in history: a slower run whose commit
isn't a descendant of the current :latest refuses to clobber it, and
a newer push mid-way through the move-latest job preempts the older
one before it can retag.
- Every main push publishes nousresearch/hermes-agent:sha-<commit>
with an org.opencontainers.image.revision label embedded.
- move-latest job reads that label off :latest, runs merge-base
--is-ancestor, and only retags (via buildx imagetools create,
registry-side, no rebuild) if our commit strictly descends.
- fetch-depth bumped to 1000 so merge-base has the history it needs.
- Release tag flow unchanged (unique tag, no race).
f4031df05d