Run maintenance operations for NextCloud

Summary:
That requires to allow APCu in CLI when running the cron.php script.

Ref T437

Test Plan: php -d apc.enable_cli=1 -f /usr/local/www/nextcloud/cron.php

Reviewers: dereckson

Reviewed By: dereckson

Maniphest Tasks: T437

Differential Revision: https://devcentral.nasqueron.org/D3306