Enable tls connection for mariadb

[gderber]

https://www.digitalocean.com/community/tutorials/how-to-configure-ssl-tls-for-mysql-on-ubuntu-18-04

[gderber]

References:

• https://mariadb.com/kb/en/secure-connections-overview/
• https://mariadb.com/kb/en/securing-connections-for-client-and-server/
• https://www.server-world.info/en/note?os=Ubuntu_20.04&p=mariadb&f=2