[microos] Add test for container registry
Set up container registry on controller node and try to serve it from there.
- Priority changed from Normal to Low
This ticket was set to "Normal" priority but was not updated within 730 days which is 2 times the period of the SLO for "Normal" tickets (365 days) as described on https://progress.opensuse.org/projects/openqatests/wiki/Wiki#SLOs-service-level-objectives . The ticket will be set to the next lower priority of "Low".