Dockerfile definition currently installs MariaDB client unintentionally

[orware]

Recently added lines

Quick summary:

A user had a functioning GitLab pipeline job to make deploy requests that broke several days ago that seemed to correspond with updating to the latest Docker image, currently at v0.213.0, that we have available from:
https://hub.docker.com/r/planetscale/pscale

The error they received when attempting to use pscale shell was:

Error: could not parse server version from: mysql Ver 15.1 Distrib 10.11.8-MariaDB, for Linux (x86_64) using readline 5.1

Further details:

Since Docker is being utilized I believe the error above may be directly originating from the Docker image that we are providing for users which is based off of the golang:1.23.2 image.

That appears to be using alpine under the hood and according to this page:
https://wiki.alpinelinux.org/wiki/MySQL

The Alpine Linux repositories no longer include the actual MySQL binaries, installing the mysql-* packages will instead install MariaDB.

So the mysql-client installation line we include in our Docker file may actually be installing the MariaDB client instead and results in the error message above now with the new version checking lines added in v0.211.0 recently.

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I was able to run a copy of the Docker image locally this morning and attempted a pscale shell command which confirmed the same error message the user received.