SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo for locahost failed after change from MySQL to MariaDB

I start to develop with a MySQL-DB and now i we wanna switch to MariaDB. So far as I know, there should be no problem but as I start with sail up and run sail artisan migrate there rise some confusing errors in the cli.

SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo for locahost failed: Name or service not known (Connection: mysql, SQL: select table_name as `name`, (data_length + index_length) as `size`, table_comment as `comment`, engine as `engine`, table_collation as `collation` from information_schema.tables where table_schema = '<OUR PROJECT NAME>' and table_type in ('BASE TABLE', 'SYSTEM VERSIONED') order by table_name)

A part of docker-compose.yml File

mariadb:
        image: 'mariadb:latest'
        ports:
            - '${FORWARD_DB_PORT:-3306}:3306'
        environment:
            MYSQL_ROOT_PASSWORD: '${DB_PASSWORD}'
            MYSQL_ROOT_HOST: "%"
            MYSQL_DATABASE: '${DB_DATABASE}'
            MYSQL_USER: '${DB_USERNAME}'
            MYSQL_PASSWORD: '${DB_PASSWORD}'
            MYSQL_ALLOW_EMPTY_PASSWORD: 1
            MARIADB_AUTO_UPGRADE: true
        volumes:
            - 'sail-<OUR PROJECT NAME>-mariadb:/var/lib/mysql'
            - './vendor/laravel/sail/database/mysql/create-testing-database.sh:/docker-entrypoint-initdb.d/10-create-testing-database.sh'
        networks:
            - sail
        healthcheck:
            test:
                - CMD
                - mysqladmin
                - ping
                - '-p${DB_PASSWORD}'
            retries: 3
            timeout: 5s

A part of database.php:

 'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => true,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

With Usernamen and password i can connect to the database by MySQL-Workbench.

Is there something wrong iin my config, or is there any additional setting to do?