https://phoenixnap.com/kb/docker-cmd-vs-entrypoint https://medium.com/swlh/wordpress-deployment-with-nginx-php-fpm-and-mariadb-using-docker-compose-55f59e5c1a
mariadb : make cmd_in_doc mariadb sh mysql -u root -p mysql -u root -p wordpress -e "select * from wp_comments;"
make cmd_in_doc mariadb sh mysql -u scarboni -p mysql -u scarboni -p wordpress -e "select * from wp_comments;"
show databases; use wordpress show tables; select * from wp_comments;