Add .gitea/workflows/release.yml: on v* tag push (or manual
dispatch) build the Docker image and push
git.linuxhg.com/games-database/games-api:<tag> plus :latest,
then create/update the Gitea Release from the annotated tag
message. Main-branch pushes do nothing so WIP never ships.
Add cliff.toml (conventional-commit grouping for release
notes), Makefile release target (cliff notes into annotated
tag, then push), and ./release wrapper (accepts 1.0 or
v1.0). Release flow: ./release v1.0, matching bookhoard.
Requires a REGISTRY_TOKEN repo Actions secret (PAT with
write:package and write:repository); Gitea's auto token
lacks package scope.
