chatops-binder.yaml

#./github/workflows/chatops-binder.yaml
name: Chatops Binder
on: [issue_comment] # issues and PRs are equivalent in terms of comments for the GitHub API

jobs:
  trigger-chatops:
    # Make sure the comment is on a PR, and contains the command "/binder"
    if: (github.event.issue.pull_request != null) &&  contains(github.event.comment.body, '/binder')
    runs-on: ubuntu-latest
    steps:
      # Use the GitHub API to:
      #  (1) Get the branch name of the PR that has been commented on with "/binder"
      #  (2) make a comment on the PR with the binder badge
      - name: comment on PR with Binder link
        uses: actions/github-script@v6
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            // Get the branch name
            github.pulls.get({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.issue.number
            }).then( (pr) => {

              // use the branch name to make a comment  on the PR with a Binder badge
              var BRANCH_NAME = pr.data.head.ref
              github.issues.createComment({
                issue_number: context.payload.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: `[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/${context.repo.owner}/${context.repo.repo}/${BRANCH_NAME}) :point_left: Launch a binder notebook on this branch`
              })
            })