I've been trying to do this. I used git add config.json before pushing and that worked. Started the app from the console. It starts, connects to the db, says NodeBB is now listening on: 0.0.0.0:58466 Great.
But I'm stuck there, I do heroku open and no dice. Application Error. Logs say App crashed, code=H10
I don't understand this heroku thing. Maybe you'll have better luck after pushing that config.json.