Minor improve to docker.py wrap

Author: rgaiacs

repo2docker/docker.py

@@ -209,7 +209,7 @@ def inspect_image(self, image):
         if "WorkingDir" not in oci_image_configuration:
             oci_image_configuration["WorkingDir"] = ""
 
-        return Image(tags=config["RepoTags"], config=oci_image_configuration)
+        return Image(tags=tags, config=oci_image_configuration)
 
     @contextmanager
     def docker_login(self, username, password, registry):