Arch Linux now accepts initramfs zstd compressed images

As linux-lts went to version 5.10, all official kernels of Arch Linux now accept initramfs zstd compressed images, so mkinitcpio defaults to zstd compressed images with version 30, which is currently being tested.

If you are using a kernel version before 5.9, be sure to change mkinitcpio.conf

COMPRESSION

to use one of the supported compressions, such as gzip, otherwise you will not be able to start images generated by mkinitcpio.