This plugin adds some commands to the heroku gem to interact with the app's repo
$ heroku plugins:install https://github.com/lstoll/heroku-repo.git
$ heroku repo:download -a appname
This will download the applications repo as a tarball.
$ heroku repo:gc -a appname
This will run a
git gc --agressive against the applications repo. This is done inside a run procress on the application.
$ heroku repo:purge_cache -a appname
This will delete the contents of the build cache stored in the repository. This is done inside a run process on the application.