This is a Heroku buildpack that allows one to multiple other buildpacks in a single deploy process. This helps support:
To use this buildpack you'll first need to set it as your custom buildpack:
$ heroku buildpacks:set https://github.com/heroku/heroku-buildpack-multi.git
From here you will need to create a
.buildpacks file which contains (in order) the buildpacks you wish to run when you deploy:
$ 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.