This role uses skopeo to perform image operations.
Also update the container roles docs to add missing documentation
for the already existing upload-container-image role. Clarify
some ambiguity about the registry and repository attributes of
the container images data structure.
Change-Id: Ib66c85daf0edacf0dd797ab34b0d629f99c7111b
Co-Authored-By: James E. Blair <jim@acmegating.com>
0c3b87f20e