Fixes integration tests

The bitnami helm chart requires the image registry to be separated from
the image name. Without this, it would try to use something like the
following as an image name: docker.io/ghcr.io/repository/multus:tag,
which is incorrect.

The integration tests currently work if the rock image is published on
docker.io, but not on ghcr.io.

tests/integration/test_multus_v4_0_2.py

@@ -15,11 +15,20 @@ def test_multus_deployment(module_instance: harness.Instance):
         IMG_NAME, "v4.0.2", IMG_PLATFORM
     )
 
+    # This helm chart requires the registry to be separated from the image.
+    rock_image = rock.image
+    registry = "docker.io"
+    parts = rock_image.split("/")
+    if len(parts) > 1:
+        registry = parts[0]
+        rock_image = "/".join(parts[1:])
+
     helm_command = k8s_util.get_helm_install_command(
         name=INSTALL_NAME,
         chart_name="oci://registry-1.docker.io/bitnamicharts/multus-cni",
-        images=[k8s_util.HelmImage(uri=rock.image)],
+        images=[k8s_util.HelmImage(uri=rock_image)],
         namespace=constants.K8S_NS_KUBE_SYSTEM,
+        set_configs=[f"image.registry={registry}"],
         chart_version="2.1.7",
     )
     module_instance.exec(helm_command)