Add a method that returns the PostgreSQL service

site-cookbooks/kosmos-postgresql/libraries/helpers.rb

@@ -29,5 +29,11 @@ class Chef
         server_node['ipaddress']
       end
     end
+
+    def postgresql_service_name
+      postgresql_version = "12"
+
+      "postgresql@#{postgresql_version}-main"
+    end
   end
 end