To clone the source of an existing application from Heroku using Git, use the
heroku git:clone command:
$ heroku git:clone -a myapp
myapp with the name of your app.
This will create a new directory named after your app with its source and complete repository history, as well as adding a
heroku git remote to facilitate further updates.
Heroku provides the git service primarily for deployment, and the ability to clone from it is offered as a convenience. We strongly recommend you store your code in another git repository such as GitHub and treat that as canonical.