[jsl9208]

What this PR does / why we need it:
This PR enables multi-architecture build support (e.g., for linux/arm64) for the kubectl-delivery image in the v1 codebase.

Currently, the Dockerfile has the architecture hardcoded to amd64. This prevents users on ARM-based systems from building or using this image with the v1 trainer.

Changes:

• Added ARG TARGETARCH.
• Replaced hardcoded amd64 with ${TARGETARCH} in the download URL.

Testing: I have verified the build locally using docker buildx:
docker buildx build --platform linux/amd64,linux/arm64 -t kubectl-delivery:multiarch .

[github-actions]

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Thanks again for contributing to Kubeflow! 🙏

[astefanutti]

@jsl9208 thanks!

The JAX integration tests are failing but it doesn't look related to your changes.

/lgtm

/assign @kubeflow/kubeflow-trainer-team

[andreyvelich]

/lgtm
/approve
Thanks @jsl9208!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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