Create a folder in TYPO3.Surf

createFolder.php

$workflow->defineTask(
	'vendor.package:createfolder',
	'typo3.surf:shell',
	array(
		'command' => 'mkdir {releasePath}/someGreatFolder',
		'logOutput' => TRUE
	)
);


$deployment->onInitialize(function() use ($workflow, $application) {
	$workflow->beforeTask(
		'typo3.surf:symlinkrelease',
		array(
			'vendor.package:createfolder'
		)
	);
}