Fix folder name

nextcloud/docker-compose.yml

@@ -22,7 +22,7 @@ services:
       - /etc/localtime:/etc/localtime:ro
       - /etc/timezone:/etc/timezone:ro
       - ${NEXTCLOUD_ROOT}/mariadb:/var/lib/mysql
-      - ${NEXTCLOUD_ROOT}/mariadb/docker.cnf:/etc/mysql/conf.d/docker.cnf:ro
+      - ${NEXTCLOUD_ROOT}/mariadb-conf/docker.cnf:/etc/mysql/conf.d/docker.cnf:ro
 
   nextcloud-redis:
     image: redis:6-alpine