New .gitea/workflows/docker.yml (alongside the untouched ci.yml wheel publish).
Runs lint + test, then builds the image and smoke-tests it — non-root uid,
/healthz 200, MCP 401 without a token and 200 with a valid bearer. On a merge to
main/dev it pushes to git.hiddenden.cafe/hiddenden/familiar (main -> :latest +
:main, dev -> :dev, plus :sha-<12>) via the existing REGISTRY_TOKEN, then does a
scoped cleanup. The two workflows are independent and don't interfere.
