ParseRef parses a string representation of an image id into an Ref value.

CanonicalName is an image name with none of the fields left to be implied by convention.

CanonicalRef is an image ref with none of the fields left to be implied by convention.

Info has the metadata we are able to determine about an image ref, from its registry.

Name represents an unversioned (i.e., untagged) image a.k.a., an image repo.

Ref represents a versioned (i.e., tagged) image.

ByCreatedDesc is a shim used to sort image info by creation date.