chore: pr label check

Author: Pangjiping

.github/workflows/pr-label-check.yml

@@ -0,0 +1,53 @@
+name: PR Label Check
+
+on:
+  pull_request_target:
+    types: [opened, reopened, labeled, unlabeled, synchronize]
+    branches: [main]
+
+permissions:
+  pull-requests: write
+
+jobs:
+  check-labels:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/github-script@v7
+        with:
+          script: |
+            const pr = context.payload.pull_request;
+            const labels = pr.labels;
+            const prNumber = pr.number;
+            const owner = context.repo.owner;
+            const repo = context.repo.repo;
+            const marker = "<!-- LABEL_CHECK_BOT -->";
+
+            if (labels.length === 0) {
+              const { data: comments } = await github.rest.issues.listComments({
+                owner, repo, issue_number: prNumber,
+              });
+              const existing = comments.filter(
+                c => c.user?.type === "Bot" && c.body?.includes(marker)
+              );
+              if (existing.length === 0) {
+                await github.rest.issues.createComment({
+                  owner, repo, issue_number: prNumber,
+                  body: `${marker}
+            ⚠️  This PR has no labels. Please add one to help categorize this change.
+
+            cc @${pr.user.login}`,
+                });
+              }
+            } else {
+              const { data: comments } = await github.rest.issues.listComments({
+                owner, repo, issue_number: prNumber,
+              });
+              const botComments = comments.filter(
+                c => c.user?.type === "Bot" && c.body?.includes(marker)
+              );
+              for (const c of botComments) {
+                await github.rest.issues.deleteComment({
+                  owner, repo, comment_id: c.id,
+                });
+              }
+            }