It seems that one of the Docker images used by the ocis-antivirus deployment is no longer available.
sudo docker pull registry.souvap-univention.de/souvap/tooling/images/c-icap:0.5.10
Error response from daemon: received unexpected HTTP status: 503 Service Temporarily Unavailable
It seems that one of the Docker images used by the ocis-antivirus deployment is no longer available.