Update webpack config to match newest webpacker gem

config/initializers/content_security_policy.rb

@@ -11,6 +11,11 @@
 #   policy.object_src  :none
 #   policy.script_src  :self, :https
 #   policy.style_src   :self, :https
+#
+#   # You need to allow webpack-dev-server host as allowed origin for connect-src.
+#   # This can be done in Rails 5.2+ for development environment in the CSP initializer
+#   # config/initializers/content_security_policy.rb with a snippet like this:
+#   policy.connect_src :self, :https, "http://localhost:3035", "ws://localhost:3035" if Rails.env.development?
 
 #   # Specify URI for violation reports
 #   # policy.report_uri "/csp-violation-report-endpoint"