Are you planning to release an RPM for RHEL/CentOS 8 soon?
So far I used my servers via nextcloudcmd using (nextcloud-sync-cron.sh (https://github.com/qcif/nextcloud-sync-cron)) to synchronize data with my Nextcloud server.
However, there is only one RPM for CentOS 7.
If it is included in the AppImage I could not access it yet. My servers don’t have a graphical interface either.
./Nextcloud-126.96.36.19900623-daily-x86_64.AppImage qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. Available platform plugins are: xcb. Aborted (core dumped)