Leverage GitHub action arm64 runner

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.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/
• 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.

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