Deployer\Deployer::setDefault PHP Method

    public static function setDefault($name, $value)
    {
        Deployer::get()->config[$name] = $value;
    }

/**
 * Setup configuration option.
 *
 * @param string $name
 * @param mixed $value
 */
function set($name, $value)
{
    if (Context::get() === false) {
        Deployer::setDefault($name, $value);
    } else {
        Context::get()->getEnvironment()->set($name, $value);
    }
}