oficial/cli/setup/setups/services.php

<?php
use Psr\Container\ContainerInterface;

return [
    Predis\ClientInterface::class => function(ContainerInterface $container) {
        $options = [
            'scheme' => 'tcp',
            'host' => $container->has('REDIS_HOST') ? $container->get('REDIS_HOST') : 'redis',
            'port' => $container->has('REDIS_PORT') ? $container->get('REDIS_PORT') : 6379
        ];
        if ($container->has('REDIS_USER')) {
            $options['username'] = $container->get('REDIS_USER');
        }
        if ($container->has('REDIS_PASSWORD')) {
            $options['password'] = $container->get('REDIS_PASSWORD');
        }
        return new Predis\Client($options);
    },
];