Adding platform target to mariadb.

Igor Bikirequested to merge
feature/ibiki-mariadb-warnings-fix into 3.0.x

This may be related to the latest update of mutagen (0.16.3) or docker desktop version (4.15.0). Without this platform flag, there were multiple warnings:

mariadb The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8).

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