upload packages to Nexus repository

In Issue #19095 (closed), Issue #18128 (moved) it's decided to leverage GL as package repository , but what should i do just now, untill it's not done, for task: "try that Gitlab instead Jenkins+Nexus". From which place can I push package to Nexus?

1. from gitlab-ci.yml
2. using uploaded package from Runner using artifacts parameter gitlab-ci.yml https://about.gitlab.com/2015/11/22/gitlab-8-2-released/
3. from Docker image using Maven may be
4. via webhook
5. using release tag?