CI Server Workloads for ContainerBuilds

[baronfel]

We should cover common CI/CD system workflows in an aim to make it easier, faster, and more secure to build containers in CI/CD systems.

Today, we cover the following workflows:

• build single-architecture containers

We need to cover the following scenarios to address key user scenarios for container building:

• Design multi-manifest (aka multi-architecture or multi-RID) publishing #87
• Implement export of Multi-arch OCI Image Manifests as Tarballs #609
• Enable referencing images in a local daemon as a base image #583 to remove the need to spawn registry:2 containers to store intermediate images