Add authconfigs to client, add logging

[BarDweller]

0.0.13 added per-registry auth, which is used in two ways..

• by the lifecycle binaries in the phase containers via the CNB_REGISTRY_AUTH var constructed from the config.
• by docker-java when it interacts with docker/podman, eg, to pull the builder,run images

The first was functional, the second was missing the call to add the auth config to the docker-java client instance.

This PR adds the missing invocation, and adds additional log statements to help debug auth issues next time ;)