If you use services with custom docker registry the host become unreadable (`registry.gitlab.com__gitlab-org__test-elastic-image`) As docker supports aliases natively `--link real_host:alias_host` it would be great to have an ability to specify the alias just like following example ``` - "registry.gitlab.com/gitlab-org/test-elastic-image->elasticsearch" ``` or maybe in some other way. /cc @tmaczukin @ayufan