handle requests for frontend files through secured route

app/controllers/concerns/basic_auth.rb

@@ -0,0 +1,9 @@
+module BasicAuth
+  extend ActiveSupport::Concern
+
+  included do
+    include ActionController::HttpAuthentication::Basic::ControllerMethods
+    http_basic_authenticate_with name: ENV['BASIC_AUTH_USERNAME'],
+                                 password: ENV['BASIC_AUTH_PASSWORD']
+  end
+end