Add Support API mock service

This will be used to run Pact tests against Support API.

test/support/pact_helper.rb

@@ -9,6 +9,7 @@
 LOCATIONS_API_PORT = 3008
 ASSET_MANAGER_API_PORT = 3009
 EMAIL_ALERT_API_PORT = 3010
+SUPPORT_API_PORT = 3011
 
 def publishing_api_host
   "http://localhost:#{PUBLISHING_API_PORT}"
@@ -46,6 +47,10 @@ def email_alert_api_host
   "http://localhost:#{EMAIL_ALERT_API_PORT}"
 end
 
+def support_api_host
+  "http://localhost:#{SUPPORT_API_PORT}"
+end
+
 Pact.service_consumer "GDS API Adapters" do
   has_pact_with "Publishing API" do
     mock_service :publishing_api do
@@ -100,4 +105,10 @@ def email_alert_api_host
       port EMAIL_ALERT_API_PORT
     end
   end
+
+  has_pact_with "Support API" do
+    mock_service :support_api do
+      port SUPPORT_API_PORT
+    end
+  end
 end