phar 打包后，redis 配置密码认证默认值传 null 会报错

return [
    'default' => [
        'host' => getenv('redis_host', '127.0.0.1'),
        'password' => getenv('redis_password', ''),
        'port' => getenv('redis_port', 6379),
        'database' => getenv('redis_database', 0),
    ],
];

ErrorException: getenv(): Passing null to parameter #2 ($local_only) of type bool is deprecated in phar:///mnt/e/*/*/build/*.phar/config/redis.php:18