add clang-format job

.github/workflows/Build.yml

@@ -13,6 +13,17 @@ env:
   kphp_build_dir: /home/kitten/kphp/build
 
 jobs:
+  clang-format:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install clang-format
+        run: wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - && \
+              apt-get update && apt-get install clang-format-18
+      - name: debug
+        run: which clang-format-18
+      - name: Run clang-format
+        run: find ./runtime-light/ -iname '*.h' -o -iname '*.cpp' | xargs clang-format-18 --dry-run -Werror
   build-linux:
     runs-on: ubuntu-latest
     strategy: