Update allowed_images fully-open example
Update allowed_images fully-open example

When using private Docker registries
(e.g. docker-reg.example.com/name/image),
you need to include `"*/*/*"` in `allowed_images`.
c-owens/gitlab-ci,gitlabhq/gitlab-ci,gitlabhq/gitlab-ci,c-owens/gitlab-ci,copystudy/gitlab-ci,copystudy/gitlab-ci,akarokr/gitlab-ci,gitlabhq/gitlab-ci,fscherwi/gitlab-ci,fscherwi/gitlab-ci,edgemaster/gitlab-ci,fscherwi/gitlab-ci,fscherwi/gitlab-ci,copystudy/gitlab-ci,c-owens/gitlab-ci,edgemaster/gitlab-ci,akarokr/gitlab-ci,AICIDNN/gitlab-ci,akarokr/gitlab-ci,copystudy/gitlab-ci,AICIDNN/gitlab-ci,AICIDNN/gitlab-ci,edgemaster/gitlab-ci,akarokr/gitlab-ci,c-owens/gitlab-ci,gitlabhq/gitlab-ci,AICIDNN/gitlab-ci,edgemaster/gitlab-ci