ENH - Replace binder on PR workflow (#65)

* 👷 Update binder workflow

* 👷 Change PR target

.github/workflows/binder-on-pr.yml

@@ -1,65 +1,15 @@
-# References:
-# This workflow adds a Binder preview URL to new PRs (via a comment on the PR).
-# This comment will only be created once, and then it will be updated with
-# every new commit
-# - https://github.com/jupyterlab/jupyterlab-git/blob/master/.github/workflows/binder-on-pr.yaml
-# - https://mybinder.readthedocs.io/en/latest/howto/gh-actions-badges.html
 name: Add binder link to PR
 on:
-  push:
-    branches:
-      - main
   pull_request:
     branches:
       - main
 
-permissions:
-  pull-requests: write
-
 jobs:
   binder:
     runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
     steps:
-      - name: comment on PR with Binder link
-        uses: actions/github-script@v3
+      - uses: jupyterlab/maintainer-tools/.github/actions/binder-link@v1
         with:
-          github-token: ${{secrets.GITHUB_TOKEN}}
-          script: |
-            var PR_HEAD_USERREPO = process.env.PR_HEAD_USERREPO;
-            var PR_HEAD_REF = process.env.PR_HEAD_REF;
-            const comments = await github.issues.listComments({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.issue.number,
-            });
-
-            var autogenerated_id = '';
-            for( var i = 0; i < comments.data.length; i++ ){
-              var act_comment = comments.data[ i ];
-              if( act_comment.body.includes( "https://mybinder.org/" ) ){
-                autogenerated_id = act_comment.id;
-              }
-            }
-
-            var date = new Date( Date.now() );
-
-            if( autogenerated_id === '' ){
-              github.issues.createComment({
-                issue_number: context.issue.number,
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                body: `[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/${PR_HEAD_USERREPO}/${PR_HEAD_REF}?urlpath=lab) :point_left: Launch a binder notebook on branch [${PR_HEAD_USERREPO}/${PR_HEAD_REF}]${PR_HEAD_USERREPO}/${PR_HEAD_REF})`
-              })
-            }
-            else {
-              github.issues.updateComment({
-                owner: context.repo.owner,
-                repo: context.repo.repo,
-                comment_id: autogenerated_id,
-                body: `[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/${PR_HEAD_USERREPO}/${PR_HEAD_REF}?urlpath=lab) :point_left: Launch a binder notebook on branch [${PR_HEAD_USERREPO}/${PR_HEAD_REF}](${PR_HEAD_USERREPO}/${PR_HEAD_REF}) \n<sub>Comment updated on ${date.toISOString()}</sub>`,
-              });
-            }
-
-        env:
-          PR_HEAD_REF: ${{ github.event.pull_request.head.ref }}
-          PR_HEAD_USERREPO: ${{ github.event.pull_request.head.repo.full_name }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}