Sonarqube in docker-compose with mysql

docker-compose.yml

version: '3'
services:
    sonarqube:
        image: 'sonarqube:6.7.6-community'
        restart: always
        networks:
            - sonarnet
        ports:
            - "10000:9000"
        volumes:
            - './sonar/conf:/opt/sonarqube/conf'
            - './sonar/data:/opt/sonarqube/data'
            - './sonar/logs:/opt/sonarqube/logs'
            - './sonar/extensions:/opt/sonarqube/extensions'
        depends_on:
          - mysql
        environment:
            sonar.jdbc.username: root
            sonar.jdbc.password: secret
            sonar.jdbc.url: jdbc:mysql://mysql:3306/sonar?useUnicode=true&characterEncoding=utf8&rewriteBatchedStatements=true&useConfigs=maxPerformance&useSSL=false            
        container_name: sonarqube

    mysql:
        # At time of writing mysql:5.7 does not grant root user the ability to login from '%' and the MYSQL_ROOT_HOST didn't work for me.
        image: mysql:5.6
        command: --default-authentication-plugin=mysql_native_password --bind-address="0.0.0.0"
        restart: always
        networks:
            - sonarnet
        volumes:
            - './mysql/lib:/var/lib/mysql'
        environment:
            MYSQL_DATABASE: "sonar"
            MYSQL_ROOT_PASSWORD: "secret"
            MYSQL_ROOT_HOST: "%"
        container_name: mysql

networks:
  sonarnet:
    driver: bridge