pin docker build env
pin docker build env

Scalingo/python-buildpack,AltSchool/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,Scalingo/python-buildpack,heroku/heroku-buildpack-python,AltSchool/heroku-buildpack-python,benmurden/heroku-buildpack-python-ember,heroku/heroku-buildpack-python,skilljar/heroku-buildpack-python