GitHub Readme.md
Highly experimental buildpack which allows deploying a single directory from a mono repository.
Add the buildpack to be the first:
$ heroku buildpacks add https://github.com/SectorLabs/heroku-buildpack-custom-root
Set a configuration variable pointing to the directory in your repository that you want to deploy:
$ heroku config:set ROOT_DIR=subdir/
Enjoy
Copy the snippet above into CLI.