Merge commit '121443c0fca383268b8022c048dd137994785aff' into glitch-soc/main

Conflicts:
- `.rubocop_todo.yml`:
  Upstream regenerated this file, glitch-soc had a specific ignore.

app/serializers/initial_state_serializer.rb

@@ -46,6 +46,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       single_user_mode: Rails.configuration.x.single_user_mode,
       trends_as_landing_page: Setting.trends_as_landing_page,
       status_page_url: Setting.status_page_url,
+      sso_redirect: sso_redirect,
     }
 
     if object.current_account
@@ -125,4 +126,8 @@ class InitialStateSerializer < ActiveModel::Serializer
   def instance_presenter
     @instance_presenter ||= InstancePresenter.new
   end
+
+  def sso_redirect
+    "/auth/auth/#{Devise.omniauth_providers[0]}" if ENV['OMNIAUTH_ONLY'] == 'true' && Devise.omniauth_providers.length == 1
+  end
 end