Update symfony/messenger recipe

Author: codedmonkey

config/packages/messenger.yaml

@@ -1,9 +1,12 @@
 framework:
     messenger:
+        # Uncomment this (and the failed transport below) to send failed messages to this transport for later handling.
         failure_transport: failed
 
         transports:
             # https://symfony.com/doc/current/messenger.html#transport-configuration
+            # async: '%env(MESSENGER_TRANSPORT_DSN)%'
+            # failed: 'doctrine://default?queue_name=failed'
             sync: 'sync://'
             async:
                 dsn: '%env(MESSENGER_TRANSPORT_DSN)%'
@@ -21,4 +24,14 @@ framework:
             messenger.bus.default: []
 
         routing:
+            # Route your messages to the transports
+            # 'App\Message\YourMessage': async
             'Symfony\Component\Mailer\Messenger\SendEmailMessage': async
+
+# when@test:
+#    framework:
+#        messenger:
+#            transports:
+#                # replace with your transport name here (e.g., my_transport: 'in-memory://')
+#                # For more Messenger testing tools, see https://github.com/zenstruck/messenger-test
+#                async: 'in-memory://'