Erreur :
- Syntax error or access violation: 1253 COLLATION 'utf8mb4_general_ci' is not valid for CHARACTER SET 'utf8'
Faire :
- https://docs.nextcloud.com/server/17/admin_manual/configuration_database/mysql_4byte_support.html
- https://help.nextcloud.com/t/solved-syntax-error-or-access-violation-1071-specified-key-was-too-long-max-key-length-is-767-bytes/34740
Ne pas oublier d'enlever le mode maintenance
sudo -u www-data php occ maintenance:mode --off