research how to auth. with private docker repos

[hydrogen18]

The current SDL has us passing in a docker container URL to kubernetes. Kubernetes pulls it down. We should be able to add support for the SDL including some sort of token or username & password & have the provider pass that to kubernetes so it can pull down the container image from a private repo.

We need to find out how private docker repos work & support whatever auth method is used by the most popular implementations. This issue is just to figure out how that works & how to pass the data to kubernetes, implementation can be another issue

[troian]

we should be able to do it now with service.params section introduced in #1348

[hydrogen18]

@boz was this added by @arijitAD ? I can't remember.

[boz]

it was added for providers but not for tenants via sdl