Create a Docker CLI Connector for Secretless

[JakeQuilty]

Is your feature request related to a problem? Please describe.

I'd like to be able to use Secretless to authenticate with the Docker Registry from the Docker CLI. This would let you be able to use commands like docker pull example/private-image without knowing the actual secrets involved with authenticating.

Describe the solution you would like

Creating a connector specific to the Docker CLI to authenticate with the Registry.

Describe alternatives you have considered

I tried to using the Docker generic HTTP config, but the way of pushing/pulling images through the API is impractical for most use cases.

Additional context

There is a lot of research about this here: #1303