Provider authentication from Docker config

[guineveresaenger]

Hello!

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Issue details

We cannot use simple password auth on Image Registry in all use cases.

• Add an auth config option that authenticate with a Docker config file found on the host machine
• Clear logic around resources that authenticate with username/password

Affected area/feature

Related: #51

[AaronFriel]

The skaffold implementation here may be usable - as a library or we could reimplement if we need to handle non-canonical references. https://github.com/GoogleContainerTools/skaffold/blob/main/pkg/skaffold/docker/auth.go