Setup Rails to Serve the HTML Generated by Webpack

app/controllers/pages_controller.rb

@@ -0,0 +1,5 @@
+class PagesController < ActionController::Base
+  def index
+    render file: 'public/packs/index.html'
+  end
+end

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
-  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
+  root 'pages#index', as: :pages_index
+  get '*path', to: 'pages#index'
 end

test/controllers/pages_controller_test.rb

@@ -0,0 +1,9 @@
+require 'test_helper'
+
+class PagesControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get pages_index_url
+    assert_response :success
+  end
+
+end