Add CORS support for Vercel frontend

Author: kaizengrowth

Gemfile

@@ -84,3 +84,4 @@ group :test do
   gem "faker"
   gem "rspec-collection_matchers"
 end
+gem "rack-cors"

config/initializers/cors.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+Rails.application.config.middleware.insert_before 0, Rack::Cors do
+  allow do
+    origins 'https://gathering-greenwood.vercel.app',
+            'http://172.232.24.146',
+            'http://localhost:5173',
+            'http://localhost:3000'
+
+    resource '*',
+             headers: :any,
+             methods: [:get, :post, :put, :patch, :delete, :options, :head],
+             credentials: true
+  end
+end