Fix WaitForLog implementation

src/Exception/ContainerWaitingTimeoutException.php

@@ -0,0 +1,22 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Testcontainers\Exception;
+
+class ContainerWaitingTimeoutException extends \RuntimeException
+{
+    protected string $containerId;
+
+    public function __construct(string $containerId, ?string $message = null, ?\Throwable $previous = null)
+    {
+        $this->containerId = $containerId;
+        $message ??= sprintf('Timeout reached while waiting for container %s', $containerId);
+        parent::__construct($message, 0, $previous);
+    }
+
+    public function getContainerId(): string
+    {
+        return $this->containerId;
+    }
+}