katib-ui-rock is based on wrong Dockerfile #32
Description
It turns out we have ROCKed the wrong dockerfile for katib-ui-rock.
The katib-ui component we 've charmed is the until recently (release 0.15) called new-ui component in the upstream. We can see this in the way they produced images. Looking at the0.15 release branch, this is the dockerfile we rocked while the image we use in our charm comes from this one. With release 0.16, they removed the old ui and thus renamed previous new-ui component to ui.
Summarizing, we need to update the ROCK to be based on this dockerfile (ui from release 0.16-rc.1).