add export button

config/initializers/csv.rb

@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+require 'csv'

config/routes.rb

@@ -44,6 +44,7 @@ Rails.application.routes.draw do
   resources :console_redirect, only: %i[index]
   resources :templates, only: %i[new create edit show destroy] do
     resources :submissions, only: %i[new create]
+    resources :submissions_export, only: %i[index new]
   end
 
   resources :start_form, only: %i[show update], path: 'd', param: 'slug' do