Switch to MariaDB's repo configurator to avoid a hard dependency on their Docker image's OS version.

Dockerfile

@@ -47,8 +47,6 @@ COPY --from=go-dependencies /go/bin/centrifugo /usr/local/bin/centrifugo
 # Add MariaDB dependencies
 COPY --from=mariadb /usr/local/bin/healthcheck.sh /usr/local/bin/db_healthcheck.sh
 COPY --from=mariadb /usr/local/bin/docker-entrypoint.sh /usr/local/bin/db_entrypoint.sh
-COPY --from=mariadb /etc/apt/sources.list.d/mariadb.list /etc/apt/sources.list.d/mariadb.list
-COPY --from=mariadb /etc/apt/trusted.gpg.d/mariadb.gpg /etc/apt/trusted.gpg.d/mariadb.gpg
 
 # Add Icecast
 COPY --from=icecast /usr/local/bin/icecast /usr/local/bin/icecast

util/docker/mariadb/setup/mariadb.sh

@@ -2,11 +2,8 @@
 set -e
 set -x
 
-{
-    echo 'Package: *'; \
-    echo 'Pin: release o=MariaDB'; \
-    echo 'Pin-Priority: 999'; \
-} > /etc/apt/preferences.d/mariadb
+curl -LsS https://r.mariadb.com/downloads/mariadb_repo_setup | bash -s -- \
+  --mariadb-server-version=11.2
 
 { \
 		echo "mariadb-server" mysql-server/root_password password 'unused'; \