readd repo checkout

Author: Hgherzog

.github/workflows/build_test.yaml

@@ -57,7 +57,8 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-
+      - name: Checkout repository
+        uses: actions/checkout@v4
       - name: Set up Docker Compose
         run: |
           sudo apt-get update