Automate signed releases with GitHub Actions #146
Description
Add a GitHub Actions workflow to automatically build signed release APK/AAB artifacts and publish them to the GitHub Releases page with auto-generated release notes.
The goal is to:
- Build release APK and AAB on version tag (e.g. vX.Y.Z)
- Sign builds using a keystore stored securely in GitHub Secrets
- Attach APK/AAB artifacts to the GitHub Release
- Auto-generate update summaries using GitHub release notes
This will reduce manual release work and make releases independent of a single maintainer.