ci: Use MariaDB for tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.51%. Comparing base (e87dc44) to head (ef5925f).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #184 +/- ## =========================================== + Coverage 63.45% 63.51% +0.06% =========================================== Files 81 81 Lines 996 995 -1 Branches 90 89 -1 =========================================== Hits 632 632 Misses 349 349 + Partials 15 14 -1 ``` | [Flag](https://app.codecov.io/gh/alarmdisplay/display/pull/184/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alarmdisplay) | Coverage Δ | | |---|---|---| | [server](https://app.codecov.io/gh/alarmdisplay/display/pull/184/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alarmdisplay) | `63.51% <100.00%> (+0.06%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=alarmdisplay#carryforward-flags-in-the-pull-request-comment) to find out more.

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