add stale issue worker flow (#1292)

* add stale issue worker flow

* lint

Author: BalaBalaYi

.github/workflows/stale.yml

@@ -0,0 +1,20 @@
+name: Close stale issues
+
+on:
+  schedule:
+    - cron: '0 0 * * *'  # run every day
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/stale@v4
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue has been automatically marked as stale because it has not had recent activity.'
+        close-issue-message: 'This issue is being automatically closed due to inactivity.'
+        days-before-stale: 90
+        days-before-close: 7
+        stale-pr-message: 'This pull request has been automatically marked as stale because it has not had recent activity.'
+        close-pr-message: 'This pull request is being automatically closed due to inactivity.'
+        stale-label: 'stale'