component/mariadb: add a test for MariaDB itself.

5 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:17:58

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:33:17

failed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:02:05

passed SlapOS.Eggs.UnitTest-Master.Python2

00:36:43

passed SlapOS.Eggs.UnitTest-Master.Python3

00:27:09