binder-badge.yaml

#./.github/workflows/binder-badge.yaml
name: Binder Badge
on: [pull_request_target]

jobs:
  binder:
    runs-on: ubuntu-latest
    steps:
    - name: comment on PR with Binder link
      uses: actions/github-script@v1
      with:
        github-token: ${{secrets.GITHUB_TOKEN}}
        script: |
          var PR_HEAD_USERREPO = process.env.PR_HEAD_USERREPO;
          var PR_HEAD_SHA = process.env.PR_HEAD_SHA;
          github.issues.createComment({
            issue_number: context.issue.number,
            owner: context.repo.owner,
            repo: context.repo.repo,
            body: `[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/${PR_HEAD_USERREPO}/${PR_HEAD_SHA}?urlpath=desktop) :point_left: Launch a binder notebook on this branch for commit ${PR_HEAD_SHA}`
          })
      env:
        PR_HEAD_SHA: ${{ github.event.pull_request.head.sha }}
        PR_HEAD_USERREPO: ${{ github.event.pull_request.head.repo.full_name }}