Add welcome email sequence template

[MAILPOET-4454]

mailpoet/lib/Automation/Engine/Builder/CreateWorkflowFromTemplateController.php

@@ -10,7 +10,7 @@ use MailPoet\UnexpectedValueException;
 class CreateWorkflowFromTemplateController {
   /** @var WorkflowStorage */
   private $storage;
-  
+
   /** @var WorkflowBuilder */
   private $templates;
 
@@ -30,6 +30,9 @@ class CreateWorkflowFromTemplateController {
       case 'delayed-email-after-signup':
         $workflow = $this->templates->delayedEmailAfterSignupWorkflow($name);
         break;
+      case 'welcome-email-sequence':
+        $workflow = $this->templates->welcomeEmailSequence($name);
+        break;
       default:
         throw UnexpectedValueException::create()->withMessage('Template not found.');
     }