Add gitlab to oauth providers

config/gitlab.yml.example

@@ -227,6 +227,9 @@ production: &base
       # - { name: 'github', app_id: 'YOUR APP ID',
       #     app_secret: 'YOUR APP SECRET',
       #     args: { scope: 'user:email' } }
+      # - { name: 'gitlab', app_id: 'YOUR APP ID',
+      #     app_secret: 'YOUR APP SECRET',
+      #     args: { scope: 'api' } }