Nextcloud-Sever as Flatpak

Project information: Nextcloud server is an open source cloud-based file hosting server.

Name: Nextcloud-server
Homepage: https://nextcloud.com/
License: AGPL
Upstream has been contacted: Upstream publicly states they do not support package formats besides a .zip release https://github.com/nextcloud/server/issues/7829

Flatpak is designed for desktop applications. Docker/podman is much better suited for servers.