Fix build

mk/disk.mk

@@ -5,6 +5,9 @@ build/bootloader: bootloader/$(ARCH)/**
 build/harddrive.bin: build/filesystem.bin bootloader/$(ARCH)/**
 	nasm -f bin -o $@ -D ARCH_$(ARCH) -D FILESYSTEM=$< -ibootloader/$(ARCH)/ bootloader/$(ARCH)/disk.asm
 
+build/harddrive.bin.gz: build/harddrive.bin
+	gzip -k -f $<
+
 build/livedisk.bin: build/kernel_live bootloader/$(ARCH)/**
 	nasm -f bin -o $@ -D ARCH_$(ARCH) -D KERNEL=$< -ibootloader/$(ARCH)/ bootloader/$(ARCH)/disk.asm