chore(github): add stale workflow

.github/workflows/stale.yml

@@ -0,0 +1,21 @@
+name: stale
+
+on:
+  schedule:
+    - cron: '30 1 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+
+    permissions:
+      issues: write
+      pull-requests: write
+
+    steps:
+      - uses: actions/stale@v9
+        with:
+          exempt-issue-labels: triage,v3
+          stale-issue-message: 'This issue is stale because it has been open for 30 days with no activity.'
+          days-before-stale: 30
+          days-before-close: -1