improve makefile to work with buildroot iso

.gitignore

@@ -4,3 +4,4 @@ boot.iso
 .vscode/
 cross-compiler-i686/
 buildroot-2025.08/
+rootfs.iso9660

Makefile

@@ -52,8 +52,15 @@ image:
 	sudo losetup -D
 
 iso:
+	mkdir tmp
+	mkdir katauos
+	sudo mount rootfs.iso9660 tmp/
+	cp -R tmp/* katauos/
 	cp katauos.bin grubshit/boot
-	grub-mkrescue -o boot.iso grubshit/
+	cp katauos.bin katauos/boot/
+	cp grubshit/boot/grub/grub.cfg katauos/boot/grub/grub.cfg
+	sudo umount tmp/
+	grub-mkrescue -o boot.iso katauos/
 
 test-cdrom:
 	qemu-system-i386 -cdrom boot.iso -m 4096M -d int