Ignore errors when maintenance mysql user command fails

roles/db/tasks/install.yml

@@ -38,6 +38,7 @@
 
 - name: Set maintenance password
   action: shell mysql -e "GRANT ALL PRIVILEGES ON *.* TO 'debian-sys-maint'@'localhost' IDENTIFIED BY '{{ debian_sys_maint_password }}' WITH GRANT OPTION; FLUSH PRIVILEGES;"
+  ignore_errors: yes
 
 - name:  set mysql root password
   action: shell mysql -e "UPDATE mysql.user SET password=PASSWORD('{{ root_mysql_password }}') where user='root'; FLUSH PRIVILEGES;"