docs: add mailing URL

Author: chagong

.github/workflows/issueLens-run.yml

@@ -53,6 +53,7 @@ jobs:
           COPILOT_GITHUB_TOKEN: ${{ secrets.PAT }}
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           JAVATOOLING_INDEX_URL: ${{ secrets.JAVATOOLING_INDEX_URL }}
+          MAILING_URL: ${{ secrets.MAILING_URL }}
 
       - name: Upload triage output
         uses: actions/upload-artifact@v4