Add PHPMyAdmin service to you Laravel Sail configuration

docker-compose.yml

    phpmyadmin:
        image: phpmyadmin/phpmyadmin
        links:
            - mysql
        environment:
            PMA_HOST: mysql
            PMA_PORT: 3306
            PMA_USER: '${DB_USERNAME}'
            PMA_PASSWORD: '${DB_PASSWORD}'
        restart: always
        ports:
            - '${FORWARD_PMA_PORT:-8081}:80'
        networks:
            - sail
        depends_on:
            - mysql