The release workflow (release.yaml) drops a key.properties at project
root and an upload-keystore.jks in app/ from Gitea secrets. This
commit makes Gradle read them when present, configure a 'release'
signing config, and attach it to the release build type. When the
files are absent (local debug builds, fresh clones), the signing
config block is skipped and release builds emit unsigned APKs - that
is the intended local behavior; only CI tags signed releases.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
686aee9109