ci: add auto closed issue/pr locking workflow

Author: NGPixel

.github/workflows/lock-threads.yml

@@ -0,0 +1,23 @@
+name: Lock Threads
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+
+concurrency:
+  group: lock
+
+jobs:
+  action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v3
+        with:
+          github-token: ${{ github.token }}
+          issue-inactive-days: 7
+          pr-inactive-days: 3