expose db connect to localhost for backups

roles/nextcloud/tasks/main.yml

@@ -30,6 +30,8 @@
       - /home/{{ system_user_name }}/docker/nextcloud/db:/var/lib/mysql
     networks:
       - name: nextcloud_internal
+    ports:
+      - "{{ BORGMATIC_BACKUP_HOST }}:{{ BORGMATIC_NEXTCLOUD_MYSQL_PORT }}:{{ NEXTCLOUD_MYSQL_PORT }}"
 
 - name: Create Nextcloud Redis Container
   community.docker.docker_container: