add workflow to mark old issues as stale

.github/workflows/close_state_issues.yml

@@ -0,0 +1,30 @@
+# © 2024 Nokia.
+#
+# This code is a Contribution to the gNMIc project (“Work”) made under the Google Software Grant and Corporate Contributor License Agreement (“CLA”) and governed by the Apache License 2.0.
+# No other rights or licenses in or to any of Nokia’s intellectual property are granted for any other purpose.
+# This code is provided on an “as is” basis without any warranties of any kind.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Close inactive issues
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v5
+        with:
+          days-before-issue-stale: 365
+          days-before-issue-close: 30
+          stale-issue-label: "stale"
+          stale-issue-message: "This issue is stale because it has been open for 12 months with no activity."
+          close-issue-message: "This issue was closed because it has been inactive for 30 days since being marked as stale."
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}