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documentation sysadmin
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I did a little bit more digging and found that the base image change from Ubuntu 16.04 to debian is certainly the culprit for why mysql is no longer available, but still baffled on how to get mysql2 to connect to MariaDB.

https://github.com/discourse/discourse_docker/commit/b95ea6f77a250793dc8e33f5e54571294db543e6#diff-882bf22f18ee0c4eb3af760ec94920e2R3