GitLab: RCE via WikiCloth markdown rendering if the `rubyluabridge` gem is installed

Summary One of the supported wiki formats is mediawiki which is rendered by WikiCloth via GitLab Markup: https://gitlab.com/gitlab-org/gitlab-markup/-/blob/v1.7.1/lib/github/markups.rbL24-28 ruby markup:wikicloth, /mediawiki|wiki/ do |content| wikicloth = WikiCloth::WikiCloth.new:data = content...