如何从Heroku中检索git存储库？

I created an app and deployed it to Heroku, but I didn't have a github git repo (I know really bad idea!) and my local git repo has been deleted (just plain stupidity here). So I have no copies of my source. I need to make some updates and the only thing I can think of is doing a checkout from Heroku.I created an app and deployed it to Heroku, but