Tidy up (consolidate) setting of the "domain" in dev and test environments

.env.development

@@ -5,3 +5,5 @@ SECRET_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
 
 OFN_REDIS_URL="redis://localhost:6379/1"
 OFN_REDIS_JOBS_URL="redis://localhost:6379/2"
+
+SITE_URL="0.0.0.0:3000"

.env.test

@@ -2,3 +2,5 @@
 # Override locally with `.env.test.local`
 
 SECRET_TOKEN="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+
+SITE_URL="test.host"

config/application.rb

@@ -45,7 +45,7 @@ module Openfoodnetwork
 
     config.after_initialize do
       # We need this here because the test env file loads before the Spree engine is loaded
-      Spree::Core::Engine.routes.default_url_options[:host] = 'test.host' if Rails.env == 'test'
+      Spree::Core::Engine.routes.default_url_options[:host] = ENV["SITE_URL"] if Rails.env == 'test'
     end
 
     # We reload the routes here

config/environments/test.rb

@@ -52,6 +52,3 @@ Openfoodnetwork::Application.configure do
 
   config.active_job.queue_adapter = :test
 end
-
-# Allows us to use _url helpers in Rspec
-Rails.application.routes.default_url_options[:host] = 'test.host'

spec/base_spec_helper.rb

@@ -46,7 +46,7 @@ Capybara.configure do |config|
 end
 
 # Override setting in Spree engine: Spree::Core::MailSettings
-ActionMailer::Base.default_url_options[:host] = 'test.host'
+ActionMailer::Base.default_url_options[:host] = ENV["SITE_URL"]
 
 FactoryBot.use_parent_strategy = false