Fatal error: Uncaught PDOException: PDO::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/sources/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php:43 Stack trace: #0 /var/www/sources/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php(43): PDO->__construct('mysql:host=$DAT...', '$DATABASE_USER', '$DATABASE_PASSW...', Array) #1 /var/www/sources/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOMySql/Driver.php(41): Doctrine\DBAL\Driver\PDOConnection->__construct('mysql:host=$DAT...', '$DATABASE_USER', '$DATABASE_PASSW...', Array) #2 /var/www/sources/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(360): Doctrine\DBAL\Driver\PDOMySql\Driver->connect(Array, '$DATABASE_USER', '$DATABASE_PASSW...', Array) #3 /var/www/sources/vendor/doctrine/dbal/lib/Doctrine/DBAL/Connection.php(833): Doctrine\DBAL\Connection->connect() #4 /var/www/sources/vendor/doctrine/orm/lib/Doctrine/ORM/Query/Exec/SingleSelectExecutor.php(50): Doctrine\DBAL\Connection->execut in /var/www/sources/app/Resources/views/components/snippets/header.html.twig on line 11