fix github action

.github/workflows/main.yml

@@ -20,10 +20,10 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: "checkout code"
-      uses: actions/checkout@v2.2.0
+        uses: actions/checkout@v2.2.0
-      with:
+        with:
-        submodules: 'recursive'
+          submodules: 'recursive'
-        fetch-depth: 0
+          fetch-depth: 0
       - name: build
         run: make base
       - name: test