How to setup post compile scripts

I need help finding some knowledge, info or tutorials on how to setup a post compile script.

Basically I need to copy a file into the game folder after the build finishes compiling in Cloud Build.

I appreciate any help!

 

There's so little information or examples here. I wish unity would post a video on this. Clearly people are using it and the feature tries to run, but somehow debugging it in progress is difficult.