Add symlink to prebuild images

Author: piranna

scripts/build

@@ -181,4 +181,4 @@ echo -e "${GRN}Successfully built Layer-3 image 'usersfs'${CLR}"
 STEP_DIR=$PREBUILD
 
 mkdir -p `dirname $STEP_DIR`          &&
-tar -cf - out/$CPU.tar.gz | gzip > $STEP_DIR || err 100
+tar -cf - out/$CPU.tar.gz out/latest | gzip > $STEP_DIR || err 100