Error during build about mariadb under trixie

[jonespm]

If you do a clean build like with

docker compose build --no-cache

There's an error related to mariadb's install. I'm not sure even why we're using mariadb dependencies over mysql anymore, but seems like a decision that was made in 2022.

tl-its-umich-edu/my-learning-analytics#1454

A fix for this seems to be installing the pgp key
RUN curl -o /etc/apt/keyrings/mariadb-keyring.pgp 'https://mariadb.org/mariadb_release_signing_key.pgp'

which is mentioned on https://mariadb.org/download/?t=repo-config&r_m=mva&d=Debian+12+%22Bookworm%22

But we might want to just remove this.