Update main.yml

.github/workflows/main.yml

@@ -49,6 +49,7 @@ jobs:
 
   # Run our CI/CD builds.
   build:
+    needs: [build_containers]
     strategy:
       matrix:
         platform:
@@ -69,6 +70,8 @@ jobs:
     name: Build
     runs-on: ${{ matrix.platform.os }}
     steps:
+    - name: Check out repository
+      uses: actions/checkout@v2
     - run: echo ${{ matrix.platform.os }} ${{matrix.platform.image}}
     - run: |
         mkdir build && cd build