GitHub Action that installs the Heroku CLI

This action installs the Heroku CLI on the runner. Once installed it will be available in the PATH for subsequent steps in the job so you can just call heroku.

When running on Linux, cache (actions/cache) is used to speed up the installation process. The cache is invalidated monthly to ensure newer versions of the CLI are installed.

This action only installs the CLI and does not authenticate a user. You will still need to ensure you are authenticated before using the CLI. You can do this by setting the HEROKU_API_KEY environment variable.

- name: Install Heroku CLI
  uses: ynab/heroku-cli-action@v1
- run: heroku whoami
  env:
    HEROKU_API_KEY: ${{ secrets.HEROKU_API_KEY }}