Create default MySQL user and MySQL database on Docker

From: Docker Hub

When you start the mysql image, you can pass some environment variables. MySql image will read those variables and do some job. See docker-entrypoint.sh file.

If you want to create user/password, you can specify MYSQL_USER and MYSQL_PASSWORD on docker-compose.yml file, environment section.

If you want to create a new database, you just need put a value for MYSQL_DATABASE.

If you put 3 above variables on .env file, the user/password above will be granted superuser access to this database.