Add clang-format check to sgl-kernel ci (#3012)

.github/workflows/pr-test-sgl-kernel.yml

@@ -16,6 +16,20 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Check clang-format
+        uses: DoozyX/clang-format-lint-action@v0.18.1
+        with:
+          source: sgl-kernel
+          extensions: h,c,cpp,hpp,cu,cuh,cc
+          clangFormatVersion: 16
+          style: file
+
   unit-test:
     if: github.repository == 'sgl-project/sglang' || github.event_name == 'pull_request'
     runs-on: 1-gpu-runner