Add feature toggle for API v1 use

Dev, test and staging need to activate the feature toggle now before
it's accessible.

config/routes/api.rb

@@ -87,13 +87,11 @@ Openfoodnetwork::Application.routes.draw do
           constraints: lambda { |_| Flipper.enabled?(:api_reports) }
     end
 
-    unless Rails.env.production?
-      namespace :v1 do
-        resources :customers
+    namespace :v1, constraints: ->(request) { Flipper.enabled?(:api_v1, request.env["warden"].user) } do
+      resources :customers
 
-        resources :enterprises do
-          resources :customers, only: :index
-        end
+      resources :enterprises do
+        resources :customers, only: :index
       end
     end
 

spec/requests/api/v1/customers_spec.rb

@@ -17,7 +17,10 @@ describe "Customers", type: :request do
   let!(:customer2) { create(:customer, enterprise: enterprise1) }
   let!(:customer3) { create(:customer, enterprise: enterprise2) }
 
-  before { login_as enterprise1.owner }
+  before do
+    Flipper.enable(:api_v1)
+    login_as enterprise1.owner
+  end
 
   path "/api/v1/customers" do
     get "List customers" do