add workflows

.github/workflows/stale.yaml

@@ -0,0 +1,22 @@
+name: 'Close stale issues and PR'
+on:
+  schedule:
+    - cron: '01 2 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write    
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: 'This issue is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 8 days.'
+          stale-pr-message: 'This PR is stale because it has been open 45 days with no activity.'
+          close-issue-message: 'This issue was closed because it has been stalled for 15 days with no activity.'
+          exempt-issue-labels: 'bug'
+          exempt-all-assignees: true
+          days-before-stale: 45
+          days-before-close: 15
+          days-before-pr-close: -1