Add workflow for closing stale issues

.github/workflows/stale.yml

@@ -0,0 +1,24 @@
+name: 'Close stale issues'
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Close stale issues
+        uses: actions/stale@v9
+        with:
+          repo-token: ${{ secrets.API_TOKEN }}
+          stale-issue-label: 'stale'
+          exempt-issue-labels: 'bug'
+          days-before-issue-stale: 30
+          days-before-issue-close: 14
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          stale-issue-message: 'This issue is stale because it has been open for 30 days with no activity.'
+          close-issue-message: 'This issue was closed because it has been inactive for 14 days since being marked as stale.'