infrastructure/app/nextcloud/integration/README.md

Install Owncloud CLI:

php ./occ
--no-interaction
--verbose
maintenance:install
--database pgsql
--database-name nextcloud
--database-host postgres
--database-user nextcloud
--database-pass nextcloud
--admin-user nextcloud
--admin-pass nextcloud
--admin-email coucou@deuxfleurs.fr

Official image entrypoint:

https://github.com/nextcloud/docker/blob/master/20.0/fpm/entrypoint.sh