Use checkDevServer

Author: Andrew Welch

src/Transcoder.php

@@ -81,6 +81,8 @@ public function __construct($id, $parent = null, array $config = [])
                 'useDevServer' => true,
                 'devServerPublic' => 'http://localhost:3001',
                 'serverPublic' => 'http://localhost:8000',
+                'devServerInternal' => 'http://craft-transcoder-buildchain:3001',
+                'checkDevServer' => true,
             ],
         ];