[Admin]: Support MariaDB officially

[shleeable]

Description

MySQL is kind of dying... last update was 4 months ago?

I will run MariaDB on staging1 and mysql on production for Loops.Plus...

and try to catch the bugs... but I'd like to see

Steps to reproduce

#419

MariaDB has Strict ONLY_FULL_GROUP_BY mode on by default. and MySQL does not.

Loops version

Main

Acknowledgements

Yes