Add release keystore for APK signing
- Added rr3-release.keystore (RSA 2048-bit, valid 27 years) - Alias: rr3key, Password: rr3community - Added KEYSTORE-README.md with usage instructions - Required for signing all future releases - Community keystore shared publicly for team use Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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