AE-5276 | Stale GitHub Action (#4331)

.github/workflows/stale.yml

@@ -0,0 +1,20 @@
+name: Mark & Close stale PRs
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "30 4 * * MON"
+
+jobs:
+  stale:
+    runs-on: [ self-hosted ]
+    steps:
+      - uses: actions/stale@v5
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          days-before-pr-stale: 70
+          stale-pr-label: 'STALE'
+          stale-pr-message: "This PR hasn't seen activity in last 10 weeks! Should it be merged, closed, or worked on further? If you want to keep it open, post a comment or remove the `STALE` label – otherwise this will be closed in 2 weeks."
+          days-before-pr-close: 14
+          close-pr-label: 'CLOSED BY STALE'
+          close-pr-message: 'This PR was closed due to 3 months of inactivity. Feel free to reopen it if still relevant.'