Add extra pipeline

.github/workflows/main.yml

@@ -66,3 +66,16 @@ jobs:
       run: python -c "import sys; print(sys.version)"
     - name: Run Tests
       run: python -u -m pyperformance.tests
+    - name: Notify Results
+      uses: actions/github-script@v5
+      if: failure() && ${{ matrix.experimental }} == true
+      with:
+        github-token: ${{secrets.GITHUB_TOKEN}}
+        script: |
+          github.rest.issues.createComment({
+            issue_number: context.issue.number,
+            owner: context.repo.owner,
+            repo: context.repo.repo,
+            body: '${{ matrix.os }} - ${{ matrix.python }} is failure but allowed as the experimental task.'
+          })
+