Add missing tag for docker manager image get (#450)

- Add missing tag for docker manager image get call, it was causing it
  to always use latest, which might not be the case for custom images

lean/components/docker/docker_manager.py

@@ -39,7 +39,7 @@ def __init__(self, logger: Logger, temp_manager: TempManager, platform_manager:
         self._platform_manager = platform_manager
 
     def get_image_label(self, image: DockerImage, label: str, default: str) -> str:
-        docker_image = self._get_docker_client().images.get(image.name)
+        docker_image = self._get_docker_client().images.get(str(image))
 
         for name, value in docker_image.labels.items():
             if name == label: