Add stale check Github Action

.github/workflows/stale.yml

@@ -0,0 +1,38 @@
+name: Stale check
+on:
+  workflow_dispatch: {}
+  schedule:
+    - cron: '0 0 * * *'
+permissions:
+  issues: write
+  pull-requests: write
+jobs:
+  stale:
+  runs-on: ubuntu-latest
+  steps:
+    - uses: actions/stale@v4
+      with:
+        days-before-stale: 30
+        days-before-close: 7
+        stale-issue-message: >
+          This issue has been automatically marked as stale because it has not
+          had any activity in the past 30 days.
+
+          The next time this stale check runs, the stale label will be removed
+          if there is new activity. The issue will be closed in 7 days if there
+          is no new activity.
+
+          Thank you for your contributions!
+        stale-pr-message: >
+          This PR has been automatically marked as stale because it has not had
+          any activity in the past 30 days.
+
+          The next time this stale check runs, the stale label will be removed
+          if there is new activity. The PR will be closed in 7 days if there
+          is no new activity.
+
+          Thank you for your contributions!
+        stale-issue-label: stale
+        stale-pr-label: stale
+        exempt-issue-label: keepalive,proposal,outdated-dependency,dev-branch
+        exempt-pr-label: keepalive,proposal,outdated-dependency,dev-branch