shlink/config/autoload/entity-manager.local.php.dist

<?php
return [

    'entity_manager' => [
        'connection' => [
            'driver' => 'pdo_mysql',
            'host' => 'shlink_db',
            'driverOptions' => [
                PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAMES utf8',
            ],
        ],
    ],

];