feat(ui): add multi-arch Docker image support for arm64 and amd64 on UI Images

[ederign]

Probably it's a overlap with: #2032

Description

Adds multi-architecture (arm64/amd64) support for the Model Registry UI Docker images. This follows the pattern from #1790.

This PR closes #2057 and should be merged after #2056 (just to make sure we test if multi arch works with docker compose).

Changes

• .github/workflows/build-and-push-ui-images.yml: Added QEMU setup, PLATFORMS env var, and platforms parameter to build-push-action
• .github/workflows/build-and-push-ui-images-standalone.yml: Added QEMU setup, PLATFORMS env var, and platforms parameter to build-push-action
• clients/ui/.env: Updated PLATFORM to linux/arm64,linux/amd64

Note: The .env change only affects local builds when using Makefile targets (make docker-buildx, make docker-buildx-standalone, make docker-buildx-federated). The GitHub Actions workflows define their own PLATFORMS env var directly in the workflow YAML files and do not use the .env file.

How Has This Been Tested?

• Successfully built multi-arch images locally for both model-registry/ui and model-registry/ui-standalone>
• Hoping for the best in GHA 🤞

Merge criteria:

• All the commits have been signed-off (To pass the DCO check)

• The commits have meaningful messages
• Automated tests are provided as part of the PR for major new functionalities; testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work.
• Code changes follow the kubeflow contribution guidelines.

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[tarilabs]

Can we not just simply use

• KEP GHA alignment for container image Signature and Attestation #2032

So to align for all Container image production? 🤔

[ederign]

@tarilabs probably yes! I didn't catch up with all PR's, but I'll review #2032 as soon as possible and close this one.
/hold

[ederign]

Closed in favor of #2032