Registers haskelseed as a Gitea Actions runner and adds
.gitea/workflows/build-and-deploy.yml that runs nix build → skopeo push →
helm deploy on every push to main. Deploy step SSHes to Railiance01 using
a dedicated deploy key (haskelseed-ci-deploy) already authorized on the node.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>