This container can be pulled via:
  docker pull registry.opensuse.org/filesystems/ceph/pacific/images/cephcsi/csi-snapshotter:v2.1.1
  docker pull registry.opensuse.org/filesystems/ceph/pacific/images/cephcsi/csi-snapshotter:v2.1.1-rev1
  docker pull registry.opensuse.org/filesystems/ceph/pacific/images/cephcsi/csi-snapshotter:v2.1.1-rev1-build2.123

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.