MariaDB docker-compose with UTF8 Collation and persistent data

docker-compose.yaml

version: '3.1'

services:

  db:
    image: mariadb
    restart: always
    command: mysqld --character-set-server=utf8 --collation-server=utf8_unicode_ci --init-connect='SET NAMES UTF8;' --innodb-flush-log-at-trx-commit=0
    ports:
      - 3306:3306
    environment:
      - MYSQL_ROOT_PASSWORD=example
      - MYSQL_DATABASE=test
      - MYSQL_USER=testuser
      - MYSQL_PASSWORD=testpassword
    volumes:
      - ./mysqldata:/var/lib/mysql