ci: lock stale issues & prs

Author: privatenumber

.github/workflows/lock-issues.yml

@@ -0,0 +1,26 @@
+name: Lock Issues & PRs
+
+on:
+  schedule:
+    - cron: '0 0 * * 0' # Every Sunday
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+
+    permissions:
+      issues: write
+      pull-requests: write
+      discussions: write
+
+    steps:
+      - name: Lock Issues & PRs
+        uses: dessant/lock-threads@v5
+        with:
+          github-token: ${{ github.token }}
+          issue-inactive-days: '91'
+          add-issue-labels: 'outdated'
+          pr-inactive-days: '91'
+          add-pr-labels: 'outdated'
+          discussion-inactive-days: '91'
+          add-discussion-labels: 'outdated'