Fires on `v*` tag push. Tags the built images with the git tag so
rollbacks are a one-liner (TAG=<previous> docker compose ... up -d).
`up -d --wait` blocks until every service healthcheck reports
healthy; a bad release fails the workflow rather than crash-looping
silently. The .env.production file containing all Gitea secrets is
removed in `if: always()` after the deploy step.
Refs #497.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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