Add support for fediverse:creator OpenGraph tag (#30398)

db/migrate/20240522041528_add_author_account_id_to_preview_cards.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class AddAuthorAccountIdToPreviewCards < ActiveRecord::Migration[7.1]
+  disable_ddl_transaction!
+
+  def change
+    safety_assured { add_reference :preview_cards, :author_account, null: true, foreign_key: { to_table: 'accounts', on_delete: :nullify }, index: false }
+    add_index :preview_cards, :author_account_id, algorithm: :concurrently, where: 'author_account_id IS NOT NULL'
+  end
+end