Story (Required)

Add the ability to build container images for multiple architectures in a single BuildRun. Add runtime validations, per-platform status reporting, and unit tests.

Background (Required)

API for multi-arch build: https://issues.redhat.com/browse/BUILD-1728

Done Checklist

• Code is completed, reviewed, documented and checked in
• Unit and integration test automation have been delivered and running cleanly in continuous integration/staging/canary environment
• Continuous Delivery pipeline(s) is able to proceed with new code included
• Customer facing documentation, API docs etc. are produced/updated, reviewed and published
• Acceptance criteria are met