7a4defbab4
## Summary
- `BuildAndroidRelease` in `ci/main.go` intentionally builds the AAB without setting up the keystore — the unsigned AAB is later stamped with `StampAndroidVersionCode` and re-signed by `SignAndroidBundle` via jarsigner.
- The old `signingConfigs.create("release")` block in `android/app/build.gradle.kts` called `error("ANDROID_KEYSTORE_PATH is not set")` at Gradle _configuration_ time, which fired even when the keystore wasn't needed for the build step.
- Fix: guard the `signingConfigs` block and the `signingConfig` assignment in the release build type behind a null-check on `ANDROID_KEYSTORE_PATH`. When the env var is absent (unsigned build path), Gradle skips the signing config entirely; when it is present (e.g. `BuildAndroidApk` via `setupKeystore`), the config is created and applied as before.
## Test plan
- Trigger `deploy.yml` via `workflow_dispatch` and verify the `Build & Deploy to Play Store` job no longer fails at step 4 with "ANDROID_KEYSTORE_PATH is not set"
- Verify `BuildAndroidApk` (which calls `setupKeystore`) still produces a correctly signed APK
Closes #439
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Co-authored-by: Thomas SharedInbox <sharedinbox@thomas-guettler.de>
Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/440