Enable installing app as pwa

config/importmap.rb

@@ -4,3 +4,4 @@ pin "@hotwired/stimulus", to: "stimulus.min.js"
 pin "@hotwired/stimulus-loading", to: "stimulus-loading.js"
 pin "application"
 pin_all_from "app/javascript/controllers", under: "controllers"
+pin_all_from "app/javascript/custom", under: "custom"

config/routes.rb

@@ -12,6 +12,9 @@ Rails.application.routes.draw do
   # Can be used by load balancers and uptime monitors to verify that the app is live.
   get "up" => "rails/health#show", as: :rails_health_check
 
+  # config/routes.rb  
+  get "/service-worker.js" => "service_worker#service_worker"
+  get "/manifest.json" => "service_worker#manifest"
   # Defines the root path route ("/")
   # root "posts#index"
 end