Add stale workflow

Author: web-flow

.github/workflows/stale.yml

@@ -0,0 +1,19 @@
+name: Stale
+
+on:
+  schedule:
+    - cron: "0 3 * * 6"
+
+jobs:
+  stale:
+    name: Stale
+    runs-on: ubuntu-latest
+    steps:
+      - name: Mark stale issues and pull requests
+        uses: actions/stale@v3
+        with:
+          repo-token: ${{ github.token }}
+          stale-issue-message: "This issue is stale because it has been open 120 days with no activity. Remove stale label or comment or this will be closed in 5 days"
+          stale-pr-message: 'It has been open 120 days with no activity. Remove stale label or comment or this will be closed in 5 days'
+          days-before-stale: 120
+          days-before-close: 5