Triggers on version tags (v*) or manual dispatch (with track selection).
- Builds signed APK → uploads to GitHub Release as downloadable asset
- Builds signed AAB → uploads to Play Store (default: internal track)
- Version code driven by GITHUB_RUN_NUMBER; display version from git tag
- Release notes read from distribution/whatsnew/whatsnew-en-US
Required secrets: KEYSTORE_BASE64, KEYSTORE_ALIAS, KEYSTORE_KEY_PASS,
KEYSTORE_STORE_PASS, PLAY_SERVICE_ACCOUNT_JSON
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
