Add clang-format github action

.github/workflows/code_layout.yml

@@ -7,8 +7,18 @@ on:
   pull_request:
 
 jobs:
-  code:
-    name: Code layout
+  c_code_layout:
+    name: C linter
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v2
+      - name: Install clang-format
+        run: sudo apt-get install clang-format
+      - name: Clang-format check
+        run: clang-format --dry-run --Werror --style=llvm lib/*.c lib/*.h lib/cunit/*.c lib/cunit/*.h
+  sql_code_layout:
+    name: SQL linter
     runs-on: ubuntu-18.04
     steps:
       - name: Install nvm