docker-compose.yml

version: '3.5'

services:
  database:
    image: mariadb:latest
    ports:
      - 3306:3306
    volumes:
      - data:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: root
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress

  wordpress:
    depends_on:
      - database
    image: wordpress:latest
    ports:
      - 80:80
      - 443:443
    volumes:
      - .:/var/www/html
    restart: always
    environment:
      WORDPRESS_DB_HOST: database
      WORDPRESS_DB_NAME: wordpress
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress

  phpmyadmin:
    image: phpmyadmin/phpmyadmin:latest
    ports:
      - 81:80
    restart: always
    environment:
      PMA_ARBITRARY: 1
      PMA_HOST: database
      MYSQL_ROOT_PASSWORD: root

volumes:
  data:

Omg.
Wordpress and docker.
Nice passwords and user for MySQL!