[4.0] Switch to NodeJS Environment (BC)

[stefanzweifel]

This PR rewrites the action to use the node12-environment instead of Docker. The Action therefore uses the default Actions environment and has access to all the installed software.

For example, it's now possible to run pre-commit hooks with husky (Closes #18).

I've decided against using packages like @actions/exec and @actions/toolkit, as I don't like the overhead of installing node packages just to execute a shell script. The code to execute a shell script via node has been inspired by https://github.com/ad-m/github-push-action/.

The next logical step would be to rewrite the shell script in JS or TS. See #44.

Testing

To the the changes, please update your workflow file to use the refactor/switch-to-js-branch of the repo.

    - uses: stefanzweifel/git-auto-commit-action@refactor/switch-to-js
      with:
        commit_message: Your Message goes here
        branch: ${{ github.head_ref }}

Test Run:

• https://github.com/stefanzweifel/git-auto-commit-action-demo-app/runs/462899230#step:5:11