This container can be pulled via:
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/nginx-ingress-controller:0.15
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/nginx-ingress-controller:0.15.0
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/nginx-ingress-controller:0.15.0-14.22

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.