[REQ] Handle secure registries

[ashnamehrotra]

What kind of request is this?

New feature

What is your request or suggestion?

Handle secure registries in copa:

• if image exists locally already, skip pulling the image
• if pulling image, handle authentication: copa will need to know how to use the auth file locally to authenticate with the registry)

[cpuguy83]

Does it not already handle this?

https://github.com/project-copacetic/copacetic/blob/fe06e35d19a24c66b95035e6b6faa2636cf5c2b5/pkg/buildkit/buildkit.go#L72-L82