mariadb: add mariadb-base-image to facilitate upstream "nightlies" #6433
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Summary
From #6426, add a 90 second test to ensure Doctrine DBAL remains compatible with MariaDB, and users aren't the ones to discover incompatibilities (like #6361).
A quay.io/mariadb-foundation/mariadb-devel:verylatest is what is going to be in the next MariaDB release, including unintentionally breaking features, this is a good change to let MariaDB know before they have committed via release to the stability of the change.
Alternates:
mariadb-base-image: "quay.io/mariadb-foundation/mariadb-devel"
tests