executed as described on docker hub:

CID=$(docker run -d --name master_container --hostname=master     -e domainname=testdomain.intranet     -e 'rootpwd=Pa$$w0rd' -p 8011:80     -e container=docker     -v /sys/fs/cgroup:/sys/fs/cgroup:ro     --tmpfs /run --tmpfs /run/lock     --cap-add=SYS_ADMIN     --restart unless-stopped univention/ucs-generic-amd64 /sbin/init) ; docker logs -f $CID

I was forced to install 'locales' package, restarting the container afterwards.

Setup broken because of missing subnet for the interface. This could be setup through web console (but with some error two which maybe can be ignored).

Setup was running somehow until some error was reported.
Is there are current supported way to use the docker images?

I did another restart of this container. UCS reports that the installation was successfull than.
But "Software Update" was reporting that for this Version there are no security updates anymore.
That would tell me, that those images from docker hub are not based on the current released version.

Is there a reliable way to build those? Found some hints where to find ("unmaintained") older versions of the relevant source
https://git.knut.univention.de/univention/internal/univention-docker-dev
is there some public mirror to check what is missing or to create some improvements?