BuildSystem: Make root partition UUID fixed

This allows specifying root as UUID which makes booting nicer experience
on real hardware

script/image-create.sh

@@ -46,6 +46,15 @@ else
 		mkpart root ext2 2M 100%
 fi
 
+fdisk "$BANAN_DISK_IMAGE_PATH" >/dev/null << EOF
+x
+u
+2
+$BANAN_ROOT_PART_UUID
+r
+w
+EOF
+
 # create loop device
 LOOP_DEV=$(sudo losetup --show  -fP "$BANAN_DISK_IMAGE_PATH" || exit 1 )
 PARTITION1=${LOOP_DEV}p1