CI: Comment when done [wheel build]

.github/workflows/build_wheels.yml

@@ -109,3 +109,20 @@ jobs:
           name: artifact
           path: dist
       - uses: pypa/gh-action-pypi-publish@release/v1
+
+  comment_on_pr:
+    if: >-
+      contains(needs.get_commit_message.outputs.message, '[wheel build]') ||
+      github.event_name == 'pull_request'
+    needs: [build_wheels, build_sdist]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Comment PR
+        uses: thollander/actions-comment-pull-request@v1
+        with:
+          message: |
+                        Artifacts generated for this PR:
+                        - [Wheels](${{ github.server_url }}/${{ github.repository }}/actions/artifacts/)
+                        Please download and test these to validate the PR.
+          comment_includes: "Artifacts generated for this PR"
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}