Mariadb not ready at the first time

[David]

In some cases, the mariadb doesn't start properly, and only starts ok when it is restarted by the livenessProbe.

First log:
https://pastebin.canonical.com/p/6P49GWWK86/

Version: '10.4.7-MariaDB-1:10.4.7+maria~bionic' socket: '/var/run/mysqld/mysqld.sock' port: 0 mariadb.org binary distribution

After restart log:
https://pastebin.canonical.com/p/sqxp344PNC/

Version: '10.4.7-MariaDB-1:10.4.7+maria~bionic' socket: '/var/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution

In the first one, the port is 0. That's what's causing the issue.