ci: update MariaDB versions #294
                
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MariaDB versions where a little out of date. 10.7 and <=10.3 are end of maintained versions.
Currently supported versions are: https://mariadb.org/about/#maintenance-policy
Add latest and very latest development versions so incompatibilities can be found pre-release
(ref:
https://mariadb.org/new-service-quay-io-mariadb-foundation-mariadb-devel/).
A healthcheck.sh script is there for convience.
(https://mariadb.com/kb/en/using-healthcheck-sh-script/).
Only MARIADB_ROOT_PASSWORD is required as env variable.