Alpine Installation (Raspberry Pi 4)

Assuming the boot media is created (sd card) then the following should, generally, get alpine up and running

1. Partition disks (as preferred) - leaving the boot partition alone
2. Use ext4 BUT one will have to manually edit setup-disk to allow the fs for the Pi
3. Make sure to mount the root partition to /mnt
4. And then make sure to mount -o remount,rw /media/<boot device> and then mount --bind /media/<boot device> /mnt/boot
5. Finally run setup-disk -m sys /mnt

This should get everything installed, after first boot one should edit fstab and make /boot/boot a bind mount to boot itself (FAT32 doesn't allow symlinking in this case)