s1panel worked on similar arch install with ext4 partitions.
on new install with mdadm raid0 swap, mdadm raid1 /boot, btrfs raid1 / and /home, fails with following error on systemd:
system_key.go:147: cannot determine nfs usage in generateSystemKey: cannot parse /etc/fstab: cannot parse dump frequency: "new"
s1panel was installed via 'snap install s1panel' - not built on machine