Invoke app-prefixed active storage task when in engine

Author: 5t111111

activestorage/lib/tasks/activestorage.rake

@@ -3,6 +3,10 @@
 namespace :active_storage do
   desc "Copy over the migration needed to the application"
   task install: :environment do
-    Rake::Task["active_storage:install:migrations"].invoke
+    if Rake::Task.task_defined?("active_storage:install:migrations")
+      Rake::Task["active_storage:install:migrations"].invoke
+    else
+      Rake::Task["app:active_storage:install:migrations"].invoke
+    end
   end
 end