Merge commit '144a406d332b034caa812ade2629df03ed4898d7' into glitch-soc/merge-upstream

Conflicts:
- `app/views/layouts/application.html.haml`:
  Upstream removed the `crossorigin` attribute from `preload_pack_asset`.
  Glitch-soc had different calls to `preload_pack_asset` because of the
  different theming system.
  Ported the change.
- `app/views/layouts/embedded.html.haml`:
  Upstream removed the `crossorigin` attribute from `preload_pack_asset`.
  Glitch-soc had different calls to `preload_pack_asset` because of the
  different theming system.
  Ported the change.

app/lib/application_extension.rb

@@ -4,6 +4,8 @@ module ApplicationExtension
   extend ActiveSupport::Concern
 
   included do
+    has_many :created_users, class_name: 'User', foreign_key: 'created_by_application_id', inverse_of: :created_by_application
+
     validates :name, length: { maximum: 60 }
     validates :website, url: true, length: { maximum: 2_000 }, if: :website?
     validates :redirect_uri, length: { maximum: 2_000 }

app/lib/vacuum/applications_vacuum.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class Vacuum::ApplicationsVacuum
+  def perform
+    Doorkeeper::Application.where(owner_id: nil)
+                           .where.missing(:created_users, :access_tokens, :access_grants)
+                           .where(created_at: ...1.day.ago)
+                           .in_batches.delete_all
+  end
+end