Add webpacker and use it for new_design

config/environments/production.rb

@@ -1,6 +1,9 @@
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
+  # Verifies that versions and hashed value of the package contents in the project's package.json
+  config.webpacker.check_yarn_integrity = false
+
   # Code is not reloaded between requests.
   config.cache_classes = true