For local images copied from an image store other than the default, we
need to be able to specify the `storage-location`. This commit enables
this functionality.
Jira: https://issues.redhat.com/browse/HMS-3235
Update the skopeo sources stage to check other container-transports [1]
for downloading container images. This commit adds a transport for
`containers-storage` in addition to the existing `docker://`
transport.
Jira: https://issues.redhat.com/browse/HMS-3235
[1] CONTAINERS-TRANSPORTS(5)
A new source module that can download a multi-image manifest list from a
container registry. This module is very similar to the skopeo source,
but instead downloads a manifest list with `--multi-arch=index-only`.
The checksum of the source object must be the digest of the manifest
list that will be stored and the manifest that is downloaded must be a
manifest-list.
