cml runner seems to try and pull images from a quay.io repo instead of dockerhub

# Bug Report

runner:

```
Warning Failed 8s (x2 over 52s) kubelet Failed to pull image "dvcorg/cml:0-dvc2-base1-gpu": rpc error: code = Unknown desc = reading manifest 0-dvc2-base1-gpu in quay.io/dvcorg/cml: unauthorized: access to the requested resource is not authorized
```

## Description

cml runner seems to try and pull images from a quay.io repo instead of https://hub.docker.com/r/iterativeai/cml/tags

### Reproduce

cml runner launch \
--cloud=kubernetes \
--labels=cml-k8s-gpu

### Expected

Kubernetes is able to pull the required image for the Job

### Environment information

Attempting to run jobs via github arc and kubernetes in an on-premise cluster.

**Additional Information (if any):**