add image registry for helm

[calvin0327]

There are two scenarios where we need to set up the registry for the image:

1. image proxy: It is slow to pull a image from docker.io, so we need to switch a proxy.
2. Offline environment: load volcano images we need to a private repository and set up a new registry.

[volcano-sh-bot]

Welcome @calvin0327!

It looks like this is your first PR to volcano-sh/volcano.

Thank you, and welcome to Volcano. :smiley:

[calvin0327]

/auto-cc

[hwdef]

/ok-to-test

[calvin0327]

@hwdef the label /ok-to-test is not work :)

[calvin0327]

@lowang-bh @hwdef PTAL

[hwdef]

@Monokaix @william-wang please trigger the CI

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: william-wang

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[william-wang]

please fix the ci failure:)

[Monokaix]

Hi, please follow the instruction https://github.com/volcano-sh/volcano/actions/runs/8826758139/job/24720544631?pr=3436#step:5:141 to make ci happy.

[calvin0327]

@Monokaix Please help to trigger the CI

[william-wang]

Have retriggered the ci.

[Monokaix]

/lgtm