Can't build app due to missing file

[RealMoondancer]

I wanted to build the app myself to test an implementation of a new feature but it can't build due to the file google-services.json missing.

FAILURE: Build completed with 2 failures.                                                      
                                                                                               
1: Task failed with an exception.                                                              
-----------                                                                                    
* What went wrong:                                                                             
Execution failed for task ':app:processDebugGoogleServices'.                                   
> File google-services.json is missing. The Google Services Plugin cannot function without it.