Migrate lock-bot to GitHub actions

.github/workflows/lock.yml

@@ -0,0 +1,16 @@
+name: ASF-lock-threads
+
+on:
+  schedule:
+    - cron: '0 1 * * *'
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Lock inactive threads
+        uses: dessant/lock-threads@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          issue-lock-inactive-days: 30
+          pr-lock-inactive-days: 30