Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `spec/models/status_spec.rb`:
  Upstream added tests too close to glitch-soc-specific tests.
  Kept both tests.

app/controllers/api/v1/accounts_controller.rb

@@ -83,10 +83,14 @@ class Api::V1::AccountsController < Api::BaseController
   end
 
   def check_enabled_registrations
-    forbidden if single_user_mode? || !allowed_registrations?
+    forbidden if single_user_mode? || omniauth_only? || !allowed_registrations?
   end
 
   def allowed_registrations?
     Setting.registrations_mode != 'none'
   end
+
+  def omniauth_only?
+    ENV['OMNIAUTH_ONLY'] == 'true'
+  end
 end