You will need to add your own google map key and firebase id to make the project build.
Both of the are set in app/src/release/res/xml/api_access.xml
Example:
<resources>
<string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">Your google maps key here</string>
<string name="firebase_id" translatable="false">Your firebase id here</string>
</resources>