add OCI types and docker auth to docker source plugin

[deitch]

The docker.py docker source plugin was failing on 2 issues:

• no authentication. It ignored $DOCKER_CONFIG/config.json (or the default ~/.docker/config.json) to get credentials.
• no support for the up to date oci types that match the docker types.

This meant:

• private images on ghcr.io or docker hub or anywhere failed
• recently created and pushed images failed, as they often use the OCI types

I added both of these. I already use it in an in-house project, figured we should upstream.

If there are tests to add, please point me in the direction, happy to do so.