Add checksum in zip

Signed-off-by: Nicholas Sun <nicholas-sun@outlook.com>

Author: nicholas-opensource

SCRIPTS/06_cleaning.sh

@@ -4,6 +4,9 @@ rm -rf `ls | grep -v "squashfs"`
 ls *rootfs.img.gz | xargs rm -fr
 gzip -d *.gz
 gzip *.img
+for gzfirm in *.gz; do
+  sha256sum "$gzfirm" >> sha256sum.txt
+done
 mv ../../../../.config config-full
 
 exit 0