Use fully qualified search registry for docker image names

[SlyIdeas]

Small issue here. The fix would be to use a fully qualified docker image name.

In Ubuntu 22.04, I must modify /etc/containers/registry.conf to allow "docker.io" as an unqualified-search-registries to pull the containers. As this is not present in the default configuration for Podman, it added an additional step.

It would be preferable to list the fully qualified names to avoid any confusion pertaining to where containers should be sourced from.