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+Has to be automated at some point.
+
+1. Make changes
+2. merge into `legacy` branch
+3. create git tag with version number, format until now `vYYYY.MM.n`
+4. write version number into `backend/.version` using `echo \"$(git rev-parse --abbrev-ref HEAD)-$(git describe)\"> ./backend/.version`
+5. write version number into the image tag in `docker-compose.prod.yml`
+6. `docker compose -f docker-compose.prod.yml build`
+7. `docker push ghcr.io/phoenixtwofive/karaoqueue:vYYYY.MM.n`
+8. update all running containers to the new tag
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