fix: Don't allow the use of reflinks

[ruben-arts]

If you are using pixi v0.11.1 you got a feature activated called reflinking. This however doesn't work correctly yet.

The issue you might get is:

Permission denied (os error 13)

This (as far as we know) only happens on btrfs filesystems, like my Fedora setup.

You can check if your on btrfs using the following command:

> lsblk -f
...
nvme0n1                                                                                            
├─nvme0n1p1 vfat   FAT32                       4C  581,4M     3% /boot/efi
├─nvme0n1p2 ext4   1.0                         3a  611,7M    30% /boot
└─nvme0n1p3 btrfs        fedora_localhost-live 87   69,6G    91% /home