heroku-buildpack-django-sass

Designed to be added as an additional buildpack after the standard heroku/python buildpack:

$ heroku buildpacks:add --index 2 https://github.com/drpancake/heroku-buildpack-django-sass.git

It runs python manage.py compilescss to generate CSS files and then runs python manage.py collectstatic --noinput again to copy them to the expected directory.