Docker: how to install the gitlab integration?

Hi @benoitc, which GitLab integration do you mean? GitLab SSO, or a GitLab webhook integration?

For GitLab SSO, you should be able to edit the config.json settings or set it up in the System console.

For webhook integrations, can you share a link to the integration you're considering? Generally you would need to set them up on your own server or using a service like Heroku.