fix: case for missing appName in getInstallOutputFileName

[LukasMod]

Summary:

Add a fallback to locate APK/AAB files with missing app names after the build process. This is needed for scenarios where Android hybrid apps do not follow the default structure like android/app.

Backgound:

The GitHub Action upload uploads the entire folder, unlike providerS3 which targets a specific file. Reference: action.yml#L298
If the build output names do not match expectations, outputFilePath is not generated and becomes undefined. As a result, the cache is not saved and the upload fails with ENOENT: no such file or directory.
This mismatch can happen when the Android folder does not follow the default structure.

AppName comes from https://github.com/react-native-community/cli/blob/main/packages/cli-config-android/src/config/index.ts Hybrid app may not have a subfolder, so an empty string is returned from getAppName

function getAppName(sourceDir: string, userConfigAppName: string | undefined) {
  let appName = '';
  if (
    typeof userConfigAppName === 'string' &&
    fs.existsSync(path.join(sourceDir, userConfigAppName))
  ) {
    appName = userConfigAppName;
  } else if (fs.existsSync(path.join(sourceDir, 'app'))) {
    appName = 'app';
  }
  return appName;
}

Test Plan

New unit tests included

---

Note

Add fallback to locate APK/AAB outputs when appName is missing, export the helper, and add unit tests.

• Android runAndroid:
  • Output file discovery (findOutputFile.ts):
    • Export getInstallOutputFileName and import readdirSync.
    • Add fallback to scan buildDirectory for files ending with -<variant>.<apk|aab> when appName is empty.
    • Retains CPU-specific and default filename checks.
• Tests:
  • Add __tests__/getInstallOutputFileName.test.ts covering CPU-specific, appName-present, and missing-appName cases.

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