Comment 3 for bug 1841611

This image is still required.
kolla/ubuntu-source-nova-novncproxy

It appears that nova-novnc init pod calls nova-novncproxy-init-assets
which attempts
{"log":"+ cp -vaR '/usr/share/novnc/*' /tmp/usr/share/novnc/\n","stream":"stderr","time":"2019-09-10T18:29:09.855514808Z"}

So a docker image with those files are required, but only during that init phase.