Write to ~/.netrc

Simply have a NETRC_HOST, NETRC_USERNAME, and NETRC_PASSWORD as the environment variables and they would be written to ~/.netrc.

Requirements

The app must have user-env-compile enabled for the buildpack to have access to config vars when building.

heroku labs:enable user-env-compile -a myapp

Read more aobut user-env-compile.

Usage

Example usage:

$ heroku create --stack cedar --buildpack http://github.com/fs-webdev/heroku-buildpack-netrc.git

Enable config vars to be visible during buildpack execution, and set the token.

$ heroku labs:enable user-env-compile
$ heroku config:set GITHUB_AUTH_TOKEN=<my-read-only-token>

Deploy your app.

$ git push heroku master  # push your changes to Heroku