Awesome! I use GitLab as well but I have not tried it out yet with doing this with GitLab CI.
The setup should be pretty similar and you should only need to edit your GitLab CI Yaml file (GitLab has a slightly different syntax than TravisCI). Let me know when you get it wo work :)

Senior Software Engineer @LeanIX. Co-founder of Sedeo. Passion for software engineering and startups. Looking forward to build great things. 有難うございます。🚀

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