Unpin mariadb:10.7 once 10.8 and 10.9 problems are solved

[stronk7]

We have just pinned MariaDB again, to 10.7, because just released 10.8 and 10.9 images have problems.

53540c3 and ec0bcf8

This issue is about to proceed to unpin it once the problems are gone.

[stronk7]

Interesting enough its seems to be some incompatibility with the new images (10.8 and 10.9) that use Ubuntu 22.04 (jammy) and older host OSs (we use 18.04).

10.7 is built using 20.04 (focal) and doesn't have that problem.

MariaDB/mariadb-docker#434

[skodak]

#225 could help - it adds support for multiple database versions

[grooverdan]

As you've undoubtedly bumped to a Docker-20.10.10 version is it time for the unpin? 10.7 (up to 10.10) are now EOL as they where short term releases.