Android リリース時に Google Maps API key を追加する

[mitsuharu]

Add your API key to your manifest file (android/app/src/main/AndroidManifest.xml):

<application>
   <!-- You will only need to add this meta-data tag, but make sure it's a child of application -->
   <meta-data
     android:name="com.google.android.geo.API_KEY"
     android:value="Your Google maps API Key Here"/>
</application>

see: https://github.com/react-native-maps/react-native-maps/blob/master/docs/installation.md#specify-your-google-maps-api-key

公開レポジトリなので、key を何か隠す必要がある