Revert "Remove mysql from apt repository sources for catalog due to e…

…xpired key (#3527)" (#3536)

This reverts commit b7337c6.

catalog/Dockerfile

@@ -39,9 +39,7 @@ ENV AIRFLOW__LOGGING__REMOTE_BASE_LOG_FOLDER=s3://openverse-airflow-logs
 
 
 USER root
-# FIXME: Remove this exclusion once the mysql PGP key is no longer expired
-RUN rm /etc/apt/sources.list.d/mysql.list \
-    && apt-get update \
+RUN apt-get update \
     && apt-get -yqq install \
       build-essential \
       libpq-dev \