https://nextcloud.com/install/#instructions-server
https://nextcloud.com/install/#install-clients

https://f-droid.org/packages/com.nextcloud.client/
https://f-droid.org/en/packages/com.nextcloud.talk2

https://github.com/nextcloud/server/issues/21519
https://docs.nextcloud.com/server/19/admin_manual/apps_management.html#using-your-own-appstore
https://github.com/nextcloud/appstore