mlcube configure with local docker image

Running mlcube configure with an MLCube that uses a local docker image that hasn't been pushed yet to the remote registry is throwing an error (and exiting with status 1). Here is the output error:

2023-08-19 01:02:07 hasan-HP-ZBook-15-G3 mlcube.config[42674] WARNING Default runner config contains parameters that are not present in the effective runner config (params=['--mount_opts']). This probably means that a new version of a runner was installed that introduced new parameters.
Error response from daemon: manifest for mlcommons/mock-model-brats:0.0.0 not found: manifest unknown: manifest unknown
2023-08-19 01:02:08 hasan-HP-ZBook-15-G3 mlcube.shell[42674] ERROR Shell.run command='docker pull mlcommons/mock-model-brats:0.0.0' status=256 exit_status=exited exit_code=1 on_error=raise
Failed to configure MLCube with error code 1.
2023-08-19 01:02:08 hasan-HP-ZBook-15-G3 mlcube.__main__[42674] ERROR ERROR:
        message: DockerRun runner failed to configure MLCube.
        description: Error occurred while pulling docker image (docker=docker, image=mlcommons/mock-model-brats:0.0.0).
        context: {'status': 'exited', 'code': 1, 'cmd': 'docker pull mlcommons/mock-model-brats:0.0.0'}
Traceback (most recent call last):
  File "/home/hasan/work/medperf_ws/mlcube/runners/mlcube_docker/mlcube_docker/docker_run.py", line 169, in configure
    Shell.run([docker, "pull", image])
  File "/home/hasan/work/medperf_ws/mlcube/mlcube/mlcube/shell.py", line 104, in run
    raise ExecutionError(
mlcube.errors.ExecutionError: Failed to execute shell command.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/hasan/work/medperf_ws/mlcube/mlcube/mlcube/__main__.py", line 258, in configure
    runner.configure()
  File "/home/hasan/work/medperf_ws/mlcube/runners/mlcube_docker/mlcube_docker/docker_run.py", line 177, in configure
    raise ExecutionError.mlcube_configure_error(
mlcube.errors.ExecutionError: DockerRun runner failed to configure MLCube. Error occurred while pulling docker image (docker=docker, image=mlcommons/mock-model-brats:0.0.0).

The reason is that MLCube tries to pull the image by default (build strategy is pull/auto).

Question: should this command instead fallback to check if the local image exists and only throw a warning instead? Perhaps when build_strategy=auto.

Start in runners/mlcube_docker/mlcube_docker/docker_run.py at configure(), then trace the configure entry point in mlcube/mlcube/main.py. Check how build_strategy=auto handles a failed docker pull and local image availability; done means a local-only image can configure without exiting with status 1, with the intended warning or fallback behavior covered.