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by Literably
GitHub Readme.md
Use multiple buildpacks on your app
$ heroku config:add BUILDPACK_URL=https://github.com/ddollar/heroku-buildpack-multi.git $ cat .buildpacks https://github.com/heroku/heroku-buildpack-nodejs.git#0198c71daa8 https://github.com/heroku/heroku-buildpack-ruby.git#v86
Copy the snippet above into CLI.