ci: add stale issue/PR cleanup workflow

Author: eikendev

.github/workflows/stale.yaml

@@ -0,0 +1,43 @@
+name: 'Close stale issues and PRs'
+
+on:
+  schedule:
+    - cron: '30 1 * * *'
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+  actions: write # Needed for stateful resume behavior
+
+jobs:
+  stale:
+    runs-on: ubuntu-slim
+    steps:
+      - uses: actions/stale@v10
+        with:
+          days-before-stale: 60
+          days-before-close: 30
+
+          stale-issue-message: >
+            This issue has been inactive for 60 days and is now marked as stale.
+            Add a comment or update labels if you want to keep it open; otherwise
+            it will be closed in 30 days.
+          stale-pr-message: >
+            This pull request has been inactive for 60 days and is now marked as stale.
+            Push new commits or comment if you want to keep it open; otherwise
+            it will be closed in 30 days.
+          close-issue-message: >
+            This issue was closed automatically after being stale for 30 days without activity.
+          close-pr-message: >
+            This pull request was closed automatically after being stale for 30 days without activity.
+
+          stale-issue-label: 'status:stale'
+          stale-pr-label: 'status:stale'
+
+          exempt-issue-labels: 'prio:critical,prio:high,type:security,status:blocked,type:feat'
+          exempt-pr-labels: 'prio:critical,prio:high,type:security,status:blocked,type:feat'
+
+          exempt-all-assignees: true
+          remove-stale-when-updated: true
+          delete-branch: false