Add MariaDB to CI

[robertsilen]

Proposed Changes

I suggest to add MariaDB to CI testing.

Types of Changes

Change to CI test.

Verification

Testing

Linked Issues

User-Facing Change

Further Comments

I identified where the database type is checked, and added a section for mariadb, but honestly I don't know how to take it further from here. Can I get some tips on how to work on this?

[brandond]

I will also note that we do validate mariadb on the kine side: https://github.com/k3s-io/kine/blob/master/scripts/test-run-mysql#L28-L30

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.92%. Comparing base (d6c20b7) to head (64678a8).
Report is 5 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (d6c20b7) and HEAD (64678a8). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (d6c20b7)	HEAD (64678a8)
e2etests	7	6

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10724      +/-   ##
==========================================
- Coverage   49.82%   43.92%   -5.90%     
==========================================
  Files         178      178              
  Lines       14801    14801              
==========================================
- Hits         7374     6501     -873     
- Misses       6083     7096    +1013     
+ Partials     1344     1204     -140     

Flag	Coverage Δ
e2etests	36.42% <ø> (-9.63%)	⬇️
inttests	19.72% <ø> (-17.01%)	⬇️
unittests	13.55% <ø> (ø)

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