fix(docker): restore mariadb service

Additionally, for now, no-op usage of the MARIADB_SOCKET_DIR
environment variable. This is particularly useful for a serious
production setup, but we don't currently use that.

Signed-off-by: Kevin Morris <kevr@0cost.org>

docker-compose.override.yml

@@ -1,21 +1,6 @@
 version: "3.8"
 
 services:
-  mariadb:
-    image: aurweb:latest
-    init: true
-    entrypoint: /docker/mariadb-entrypoint.sh
-    command: /usr/bin/mysqld_safe --datadir=/var/lib/mysql
-    ports:
-      # This will expose mariadbd on 127.0.0.1:13306 in the host.
-      # Ex: `mysql -uaur -paur -h 127.0.0.1 -P 13306 aurweb`
-      - "13306:3306"
-    volumes:
-      - mariadb_run:/var/run/mysqld # Bind socket in this volume.
-      - mariadb_data:/var/lib/mysql
-    healthcheck:
-      test: "bash /docker/health/mariadb.sh"
-
   mariadb_init:
     depends_on:
       mariadb: