mariadb missing zstd

While trying to move to the mariadb hummingbird image I needed to upgrade my schema. This is a pretty common thing when upgrading and the lack of zstd causes this, and I suppose any dump, to fail.

[ERROR] [Entrypoint]: Unable backup system database for upgrade from unknown_version. photo-db2[852067]: mariadb-dump: Got errno 32 on write photo-db2[852067]: /usr/local/sbin/docker-entrypoint.sh: line 583: zstd: command not found

I believe we just need to add the package and then maybe some functional tests for common actions like this. Does that sound right?

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