Let's check it

.github/workflows/c.yml

@@ -0,0 +1,18 @@
+name: C
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v2
+    - name: make clean
+      run: make clean
+    - name: make
+      run: make