ci: add stale.yml (Issues/PRs nach 30d stale, nach 37d auto-close)

Author: lukisch

.github/workflows/stale.yml

@@ -0,0 +1,38 @@
+name: 'Stale Issues & PRs'
+
+on:
+  schedule:
+    - cron: '30 1 * * *'  # Daily at 01:30 UTC
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v9
+        with:
+          stale-issue-message: >
+            This issue has been automatically marked as stale because it has not had
+            recent activity. It will be closed in 7 days if no further activity occurs.
+            If this is still relevant, please comment or remove the stale label.
+          stale-pr-message: >
+            This pull request has been automatically marked as stale because it has not had
+            recent activity. It will be closed in 7 days if no further activity occurs.
+            If this is still relevant, please comment or remove the stale label.
+          close-issue-message: >
+            This issue was closed because it has been stale for 7 days with no activity.
+            Feel free to reopen if this is still relevant.
+          close-pr-message: >
+            This pull request was closed because it has been stale for 7 days with no activity.
+            Feel free to reopen if this is still relevant.
+          days-before-stale: 30
+          days-before-close: 7
+          stale-issue-label: 'stale'
+          stale-pr-label: 'stale'
+          exempt-issue-labels: 'priority: high,help wanted,good first issue'
+          exempt-pr-labels: 'priority: high'
+          operations-per-run: 30