Add stale action

.github/workflows/stale.yml

@@ -0,0 +1,20 @@
+name: 'Close stale issues'
+on:
+  workflow_dispatch: null
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  stale:
+    permissions:
+      issues: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v6
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days.'
+          stale-issue-label: 'wontfix'
+          exempt-issue-labels: 'help wanted'
+          close-issue-message: 'This issue was closed because it has been stalled for 7 days with no activity.'
+          days-before-issue-stale: 30
+          days-before-issue-close: 7