Adds closed issue locking workflow

.github/workflows/issues-lock.yml

@@ -0,0 +1,17 @@
+name: 'Lock closed issues'
+
+on:
+    schedule:
+        - cron: '30 1 * * *'
+    workflow_dispatch:
+
+jobs:
+    stale:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: dessant/lock-threads@v2
+              with:
+                  github-token: ${{ secrets.GITHUB_TOKEN }}
+                  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.'
+                  issue-lock-inactive-days: 30
+                  process-only: 'issues'