Don't pass any parameters to the checkout action (#34)

* don't pass any parameters to the checkout action

* re-add the fetch-depth parameter

.github/workflows/build_container_images.yml

@@ -28,8 +28,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
         with:
-          ref: main
-          path: main
+          # We want a full clone of the repo so that the rev-list count below is correct
           fetch-depth: 0
 
       - name: Set up QEMU