Support arm64 builds

[ed-pai]

What type of PR is this?
/kind feature

What this PR does / why we need it:

Updates build scripts for multi-arch support (arm64 & amd64). This enables support for Nvidia GH200/GH200/DGX-Spark system. The change leverages Go's built-in cross compiling to handle arm64 binary and image creation on the GCP servers. Validated cross compiling works to build amd64 from an arm64 system with make image-build PLATFORMS=linux/amd64 IMAGE_TAG=epp:test-amd64-latest. Validated image runs on GH200 system.

Which issue(s) this PR fixes:

Fixes #685

Does this PR introduce a user-facing change?:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: ed-pai / name: Ed Sealing (4067a45, 836ed1d)

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[gerred]

Bump on this. --build-arg would be implicit in most cases or builder dependent, but GOARCH would remain. This would be a great change.

[shmuelk]

Thanks for the changes

/lgtm

[shmuelk]

/ok-to-test

[nirrozenbaum]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ed-pai, nirrozenbaum

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