Support for multiplatform container imege (amd64 and arm64)

[tenzen-y]

/kind feature

I'd like to support multiplatform container image (amd64 and arm64), same as kubeflow/katib#1900 so that users can run on arm machines such as NVIDIA DGX Server with Grace CPU.

ref: https://docs.docker.com/desktop/multi-arch/

[johnugeorge]

Ref: #1674
@tenzen-y Should we add ARCH as param like in Katib?

[tenzen-y]

Ref: #1674 @tenzen-y Should we add ARCH as param like in Katib?

Yes, we need to add parameters to Dockerfile and configs for Github Actions like in Katib.

[tenzen-y]

I will work on this before the next feature freeze date.