Bug 1810053

.The default registries search list in `/etc/containers/registries.conf` has been updated The default `registries.search` list in `/etc/containers/registries.conf` has been updated to only include trusted registries that provide container images curated, patched, and maintained by Red Hat and its partners. Red Hat recommends always using fully qualified image names including: * The registry server (full DNS name) * Namespace * Image name * Tag (for example `registry.redhat.io/ubi8/ubu:latest`) When using short names, there is always an inherent risk of spoofing For example, a user wants to pull an image named `foobar` from a registry and expects it to come from `myregistry.com`. If `myregistry.com` is not first in the search list, an attacker could place a different `foobar` image at a registry earlier in the search list. The user would accidentally pull and run the attacker image and code rather than the intended content. Red Hat recommends only adding registries which are trusted, that is registries which do not allow unknown or anonymous users to create accounts with arbitrary names. This prevents an image from being spoofed, squatted or otherwise made insecure.