Enabling Mattermost on the Gitlab Instalation

A Self-hosted installation of GitLab comes with an extremely interesting and useful tool that is disabled by default, the Mattermost chat server, think of it as a self-hosted and better Slack.
If you installed GitLab using the Omnibus package, the recommended way, you can enable it and set up a letsencrypt certificate in a few steps as described bellow.

Open the file ‘/etc/gitlab/gitlab.rb’ and find the line:
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