Github action workflow should checkout the code.

.github/workflows/build.yml

@@ -7,6 +7,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
+    - uses: actions/checkout@v2
+    - id: WHATSUP
+      run: ls -l
     - id: CONFIGURE
       run: ./configure
     - id: MAKE