To push an arbitrary git commit from your git repository to WPEngine, you can issue this simple command:
git push —force production fd35212b59f1d302dc598abab0849c429fa251e9:master
This will force the git server on WPEngine to take the revision (in this case,
fd35212b59f1d302dc598abab0849c429fa251e9) your git client is sending it. Perfect for rolling back a shitty commit to master.
Also, this works for arbitrary reflogs, so a branch, a ref, or a tag would be perfectly acceptable in this situation.