Create stale.yml

.github/workflows/stale.yml

@@ -0,0 +1,17 @@
+name: Stale issue and pull requests
+
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: This issue has been open 30 days without activity. It will be closed in 5 days if it remains inactive.
+          stale-pr-message: This pull request has been open 30 days without activity. It will be closed in 5 days if it remains inactive.
+          days-before-stale: 30
+          days-before-close: 5