feature: should need build image for model-downloader in initcontainer

[samzong]

Describe the feature

currently, if enable model-downloader, It will base on a slim python image and download huggingface in real time, which will increase initial time. Should we consider converting it into an image? Include huggingface.

Why do you need this feature?

No response

Additional context

No response

[samzong]

@Xunzhuo @rootfs What do you think?

[rootfs]

@samzong sounds a good idea.

[samzong]

/assign @samzong

PR #738 at first support new image,

when #738 merged, I will follow upgrade helm chart.