Add warning to show that a sync queue is in use

src/Command/QueueTasksCommand.php

@@ -10,6 +10,7 @@
 use Torr\Cli\Console\Style\TorrStyle;
 use Torr\TaskManager\Exception\Registry\UnknownTaskKeyException;
 use Torr\TaskManager\Manager\TaskManager;
+use Torr\TaskManager\Receiver\ReceiverHelper;
 use Torr\TaskManager\Registry\Data\Task;
 use Torr\TaskManager\Registry\TaskRegistry;
 
@@ -21,6 +22,7 @@ final class QueueTasksCommand extends Command
 	public function __construct (
 		private readonly TaskRegistry $taskRegistry,
 		private readonly TaskManager $taskManager,
+		private readonly ReceiverHelper $receiverHelper,
 	)
 	{
 		parent::__construct();
@@ -42,7 +44,12 @@ protected function configure () : void
 	protected function execute (InputInterface $input, OutputInterface $output) : int
 	{
 		$io = new TorrStyle($input, $output);
-	$io->title("Task Manager: Queue Task");
+		$io->title("Task Manager: Queue Task");
+
+		if ($this->receiverHelper->hasSyncTransport())
+		{
+			$io->caution("The app is using sync transports: that means that registered tasks are directly worked on.");
+		}
 
 		try
 		{

src/Receiver/ReceiverHelper.php

@@ -0,0 +1,37 @@
+<?php declare(strict_types=1);
+
+namespace Torr\TaskManager\Receiver;
+
+use Symfony\Component\DependencyInjection\Attribute\TaggedIterator;
+use Symfony\Component\Messenger\Transport\Sync\SyncTransport;
+use Symfony\Component\Messenger\Transport\TransportInterface;
+
+/**
+ * @internal
+ */
+final class ReceiverHelper
+{
+	/**
+	 */
+	public function __construct (
+		/** @var iterable<TransportInterface> */
+		#[TaggedIterator("messenger.receiver")]
+		private readonly iterable $transports,
+	) {}
+
+	/**
+	 * Returns whether the app uses sync transports
+	 */
+	public function hasSyncTransport () : bool
+	{
+		foreach ($this->transports as $transport)
+		{
+			if ($transport instanceof SyncTransport)
+			{
+				return true;
+			}
+		}
+
+		return false;
+	}
+}