Building on the Fedora packaging files from #950, this adds a CI workflow
to automatically build RPM packages for Fedora distributions.
The workflow:
- Builds both binary and debug RPMs using rpkg
- Tests package installation in the CI environment
- Publishes packages to Forgejo's RPM registry
- Uploads artifacts for easy download
Thanks to ginger for providing the initial Fedora build files that made
this CI pipeline possible.
