Adds a second tag to dev-channel image builds: when a branch is in the
form <prefix>/<whatever>, the image is also pushed as
ghcr.io/keboola/agnes-the-ai-analyst:dev-<prefix>-latest.
Enables per-developer dev VMs on GRPN (and elsewhere) to auto-deploy
without knowing the specific branch slug. Each VM pins its .env to
AGNES_TAG=dev-<prefix>-latest, and the auto-upgrade cron (5 min tick)
picks up the newly pushed image on the next run.
Common Git Flow prefixes are deliberately skipped so feature/*, fix/*,
hotfix/* etc. don't create noise tags. Matched list:
feature, fix, hotfix, bugfix, docs, chore, test, ci, ops, refactor,
perf, style, build.
Verified locally against several branch names:
zs/my-feature -> dev-zs-latest
vr/foo -> dev-vr-latest
pc/bar-baz -> dev-pc-latest
feature/xyz -> (skipped)
fix/bug -> (skipped)
main -> (no-op, stable channel)
test-no-slash -> (no-op, no slash)
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