Move from image:tag to repo/image:tag
Summary
Some users want an easy way to change the base repository of our images. For example some installations restrict access to unknown registries, or some have on-premise registries which proxy external images.
Right now for someone to support this, they have have to manually override the image
field all containers. This is quite a lot of work to maintain, and could be fragile if we add a new image.
Instead what would be easier, would be to switch to a repo/image:tag
layout, where they can simply customize the repository and leave the image:tag unchanged.