no support for docker_image option for creating clusters

[tplass-ias]

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Expected Behavior

• ability to specify docker image to use from deployment.yaml for dbx
• feature parity w/ terraform provider: https://registry.terraform.io/providers/databricks/databricks/latest/docs/resources/cluster#docker_image

Current Behavior

missing support for specifying docker image to use via dbx deployment.yaml

Steps to Reproduce (for bugs)

1. follow code path for handling job_clusters options
2. underlying class has no option mentioning docker or containers: https://github.com/databrickslabs/dbx/blob/34bd186956915d70792621faa1a8bc38f38a9d41/dbx/models/workflow/common/new_cluster.py#L36-L46

Context

We are specifically looking for ECR support

Your Environment

• dbx version used: v0.8.18 (inspected code in main while this was the latest version)
• Databricks Runtime version: n/a