Im fairly new to docker and so im trying to learn more about it using a laravel project, im following this tutorial:
https://www.digitalocean.com/community/tutorials
php:7.3-fpm now use Debian 10 (Buster) as its base image and Buster ships with MariaDB, so just replace mysql-client with mariadb-client should fix it.
mysql-client
mariadb-client