fix: honour the --broker-token CLI param

Closes: pact-foundation/pact-ruby-standalone#33

lib/pact/provider_verifier/app.rb

@@ -49,6 +49,7 @@ def setup
         set_environment_variables
         require_rspec_monkeypatch_for_jsonl
         require_pact_project_pact_helper # Beth: not sure if this is needed, hangover from pact-provider-proxy?
+        set_broker_token_env_var
       end
 
       def set_environment_variables
@@ -214,6 +215,12 @@ def wait_until_provider_available
           end
         end
       end
+
+      def set_broker_token_env_var
+        if options.broker_token && !ENV['PACT_BROKER_TOKEN']
+          ENV['PACT_BROKER_TOKEN'] = options.broker_token
+        end
+      end
     end
   end
 end