CI: Comment when done [wheel build]

.github/workflows/build_wheels.yml

@@ -109,3 +109,19 @@ 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 on PR
+        env:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        run: |
+          PR_COMMENT="Artifacts generated for this PR:"
+          PR_COMMENT+="\n\n- [Wheels](${{ github.server_url }}/${{ github.repository }}/actions/artifacts/)"
+          PR_COMMENT+="\n\nPlease download and test these builds to validate the PR."
+          gh pr comment "${{ github.event.pull_request.number }}" --body "$PR_COMMENT"