in config/initializers/1_settings.rb [11:24]
def build_gitlab_ci_url
if gitlab_ci_on_non_standard_port?
custom_port = ":#{gitlab_ci.port}"
else
custom_port = nil
end
[ gitlab_ci.protocol,
"://",
gitlab_ci.host,
custom_port,
gitlab_ci.relative_url_root
].join('')
end