Environment variable `ADAPTDL_SUBMIT_REPO` (external repo) doesn't work with a tag

[odp]

export ADAPTDL_SUBMIT_REPO=registry.foo.com/dev/adaptdl-submit:latest and then adaptdl submit results in job failure with Message: PodTemplate "resnet18-cifar10-v2-elastic-5b4xl" is invalid: template.spec.containers[0].image: Required value.

Workaround:
Turns out removing the latest tag from the env variable does seem work.