[Feature] Support custom ray-job-submitter container spec for Sidecar mode

[64bitpandas]

Search before asking

• [x] I had searched in the issues and found no similar feature requirement.

Description

I've been trying out the new Rayjob sidecar submission mode. However, my jobs rely on a script located on a volumeMount and it does not appear that there is a straightforward way to patch this into the ray-job-submitter container. It would be helpful to have the ability to specify a custom spec for the ray-job-submitter container in the same way that it's possible to do so for the ray-head container.

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• [x] Yes I am willing to submit a PR!

[dalaoqi]

@Future-Outlier I'd like to help with this.