ci: automate closing stale issues

Signed-off-by: Babak K. Shandiz <babakks@github.com>

.github/workflows/stale-issues.yml

@@ -0,0 +1,36 @@
+name: Marks/closes stale issues
+on:
+  schedule:
+    - cron: "0 3 * * *" # 3 AM UTC
+
+permissions:
+  issues: write
+
+jobs:
+  mark-stale-issues:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          start-date: "2025-07-10T00:00:00Z"  # Skip for issues created before this date
+          days-before-issue-stale: 30
+          only-issue-labels: 
+            "needs-triage,needs-user-input"   # Only issues with all of these labels can be marked as stale
+          exempt-issue-labels: "keep"         # Issues marked with this label should not be marked as stale
+          stale-issue-label: stale            # Mark stale issues with this label
+          stale-issue-message: |
+            This issue has been automatically marked as stale because it has not had any activity in the last 30 days,
+            and it will be closed in 30 days if no further activity occurs.
+
+            If you think this is a mistake, please comment on this issue to keep it open.
+
+          days-before-issue-close: 30
+          close-issue-reason: "not_planned"
+          close-issue-message: |
+            This issue has been automatically closed due to inactivity.
+
+            If you think this is a mistake, please comment on this issue.
+
+          # Exclude PRs from closing or being marked as stale
+          days-before-pr-stale: -1
+          days-before-pr-close: -1