Allow multiple docker-compose configs

Up to now, the docker only supports one docker-compose.yml. There should be the possibility use as many as wanted

$cfg['modules'][ DOCKER_MODULE_NAME ]['paths']['configs'] contains an array with all config files to be loaded
$cfg['modules'][ DOCKER_MODULE_NAME ]['paths']['config'] will be used as first config file if set
if any config file is changed, the containers will be rebuilt.