The existing test:package-smoke script only supports .AppImage and .deb formats.
Skip this check in the RPM-only workflow since electron-builder validates the package structure during build.
- Add release-desktop-rpm.yml for building Linux RPM packages
- Supports x64 and ARM64 architectures
- Uses electron-builder to generate RPM directly (no AppImage)
- Independent workflow for easy upstream merging
- Includes RPM installation instructions in release notes