Implement multi-arch builds support with use of docker buildx in the pipeline

[Sawthis]

Description

Implement multi-arch builds and support for arm64 architecture with use of docker buildx in the image builder pipeline.

Acceptance Criteria

--- Pipeline changes

• Create a new pipeline path for docker buildx build.
• Use native ADO Docker task if possible.
• Create a new docker buidler instance using docker buildx create --use, see: https://docs.docker.com/reference/cli/docker/buildx/create/
• Implement pre-authentication to the docker registry using gcloud.
• Add flag for multi-arch builds with default value (amd64 + arm64) for docker buildx command.

Attachments

#12675 (comment)