This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/alertmanager:0.35
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/alertmanager:0.35.0
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/alertmanager:0.35.0-44.274
  docker pull registry.opensuse.org/opensuse/factory/arm/totest/containers/opensuse/alertmanager:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.