github: add workflow action

.github/workflows/lock.yml

@@ -0,0 +1,31 @@
+name: Lock Threads
+
+on:
+  schedule:
+    - cron: "30 12 * * *"
+  workflow_dispatch:
+
+concurrency:
+  group: lock
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+      discussions: write
+    steps:
+      - uses: dessant/lock-threads@v5
+        with:
+          issue-inactive-days: "30"
+          issue-comment: >
+            I'm going to lock this issue because it has been closed for _30 days_. ⏳
+
+            This helps our maintainers find and focus on the active issues.
+            If you have found a problem that seems similar to this, please file a new
+            issue and complete the issue template so we can capture all the details
+            necessary to investigate further.
+          pr-inactive-days: "30"
+          discussion-inactive-days: "30"
+          process-only: "issues,prs,discussions"