Add stale/lock bots (#2299)

.github/workflows/lock.yml

@@ -0,0 +1,21 @@
+name: Lock
+
+on:
+  schedule:
+    - cron: "0 * * * *"
+  workflow_dispatch:
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v2
+        with:
+          github-token: ${{ github.token }}
+          pr-lock-inactive-days: "1"
+          pr-lock-reason: ""
+          process-only: prs