Lock closed issues after 90 days without activity

.github/workflows/lock.yml

@@ -0,0 +1,21 @@
+name: 'Lock threads'
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v2
+        with:
+          github-token: ${{ github.token }}
+          issue-lock-inactive-days: '90'
+          issue-exclude-created-before: ''
+          issue-exclude-labels: 'one-day-maybe'
+          issue-lock-labels: ''
+          issue-lock-comment: ''
+          issue-lock-reason: 'resolved'
+          process-only: ''