Update manual commands for installing MariaDB
Update manual commands for installing MariaDB

* Split php7.3-mysql into its own command (to isolate the MariaDB install madness)
* Install MariaDB 1/2 times (this attempt will error out but get us close enough to run the next command)
* Run mysql_install_db
* Install MariaDB 2/2 times (this attempt will succeed, but it won't start MariaDB automatically)
* Start MariaDB
* Run mysql_secure_installation

thegreatsunra/lemp-cloud-init