Add sudo for creating backups.

miniserver.yaml

@@ -17,6 +17,9 @@
 
         - name: Backup mysql databases
           shell: mysqldump -u{{ mysql_user }} -p{{ mysql_password }} {{ item }} > {{ backup_dir }}/{{ item }}-{{ ansible_date_time.iso8601_basic_short }}.sql
+          become: yes
+          become_method: sudo
+          become_user: root
           loop: "{{ databases }}"
 
         - name: Compress database backup files