Add workflow to lock stale closed issues

.github/workflows/lock.yml

@@ -0,0 +1,20 @@
+name: 'Lock Threads'
+
+on:
+  schedule:
+    - cron: "0 */12 * * *"
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v2
+        with:
+          github-token: ${{ github.token }}
+          issue-lock-inactive-days: '60'
+          pr-lock-inactive-days: '60'
+          issue-lock-reason: 'resolved'
+          pr-lock-reason: 'resolved'
+
+          issue-lock-comment: 'This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.'
+          pr-lock-comment: 'This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new pull request for related changes.'