Merge branch 'gitlab_disallow_username_change' into 'master'

Disallow changing of the Gitlab username

See merge request !328

roles/gitlab/tasks/main.yml

@@ -45,6 +45,7 @@
         gitlab_rails['lfs_enabled'] = true
         gitlab_rails['gitlab_shell_ssh_port'] = 222
         gitlab_rails['gitlab_default_can_create_group'] = false
+        gitlab_rails['gitlab_username_changing_enabled'] = false
         gitlab_rails['initial_root_password'] = "{{ vault_gitlab_root_password }}"
         gitlab_rails['smtp_enable'] = true
         gitlab_rails['smtp_address'] = 'mail.archlinux.org'