This container can be pulled via:
  docker pull obs.pg.labs.percona.com/percona/test/containers-el/percona/hello-el:2.12.3
  docker pull obs.pg.labs.percona.com/percona/test/containers-el/percona/hello-el:2.12.3-4.1
  docker pull obs.pg.labs.percona.com/percona/test/containers-el/percona/hello-el:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.