Add debug APK build to the release workflow:
- Build both release and debug APKs
- Rename debug APK with "-debug" suffix (e.g., matedroid-0.7.1-debug.apk)
- Upload both APKs to releases and as artifacts
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
- Build APK automatically when a release is published
- Upload APK as release asset
- Support custom keystore signing via GitHub secrets
- Fall back to debug signing when secrets not configured