Leverage GitHub action arm64 runner

[tenzen-y]

What you would like to be added?

I would like to restructure our container image-building mechanism by leveraging the arm64 runner.

Currently, we are building the multi-arch container image by QEMU, and the emulation gives us painfully longer building time.
I guess that we can improve the CI duration once we build the multi-arch image with multiple GitHub actions runner (and arm64).

• https://github.com/kubeflow/training-operator/tree/master/.github/workflows
• https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners

Why is this needed?

This probably allows us to compress image building and CI time.

Love this feature?

Give it a 👍 We prioritize the features with most 👍

[tenzen-y]

/remove-label lifecycle/needs-triage

[mahdikhashan]

@tenzen-y can I help with this? i worked on a ci issue on katib as well.

[tenzen-y]

@tenzen-y can I help with this? i worked on a ci issue on katib as well.

If you can take this, I would really appreciate it