This container can be pulled via:
  docker pull registry.opensuse.org/systemsmanagement/uyuni/snapshots/2022.03/containers/uyuni/proxy-salt-broker:4.3.7
  docker pull registry.opensuse.org/systemsmanagement/uyuni/snapshots/2022.03/containers/uyuni/proxy-salt-broker:4.3.7.6.29.uyuni1
  docker pull registry.opensuse.org/systemsmanagement/uyuni/snapshots/2022.03/containers/uyuni/proxy-salt-broker:beta
  docker pull registry.opensuse.org/systemsmanagement/uyuni/snapshots/2022.03/containers/uyuni/proxy-salt-broker:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.