How do I get the approvers of a pull request using GitHub Actions / Workflows?

In a GitHub Action.

From all of the reviewers of a pull request

The people who have approved said pull request

I want to get their username.

I am expecting there is a value I can pass to a "step" in the workflow. Something like how there is ${{ github.event.pull_request.body }}

I am wanting to get a value like: APPROVERS: ${{ github.event.pull_request.reviewers }} so I can parse it to a custom script.

Because there isn't anything in the default GitHub workflow specification (that I could find), I ended up just making this open-source GitHub Action that will get that info for you: https://github.com/marketplace/actions/get-github-pull-request-reviews

Easy as just adding this step into my workflow:

- name: Get GitHub Pull Request Reviewers
  id: reviews
  # Versions come from https://github.com/LiamPerson/get-reviews-action/releases
  uses: LiamPerson/get-reviews-action@SPECIFY_ME # Specify the version you want by writing in a tag from the link above. E.g: v1.0

Then consuming the result like so:

- name: Consumes reviews
  uses: some/workflow@version
  with:
    RELEASES_JSON_FILE: ${{ steps.reviews.outputs.reviews_file_path }} # Note `reviews` is just the id used to identify the step earlier

Only thing to be careful of is, this will just give you a file with the reviews rather than a JSON string as the string is too much to store in the Action variables.