On every push to main: build both images once (SHA + moving `test`
tag), push to the Gitea registry, SSH-deploy the Test stage, wait for
readiness, run the new Playwright smoke suite (SPA shell, web
liveness, api healthz/readyz) against https://test.dorfteich.cloud,
and on green retag the identical SHA images as `int` and deploy Int.
The CI image-build job becomes PR-only to avoid double builds on main.
Part of #8
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
