[skip ci] Add comment for ci_e2e.sh (#12424)

Signed-off-by: Jenny Li <jing.li@zilliz.com>

tests/scripts/ci_e2e.sh

@@ -22,6 +22,7 @@ while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symli
 done
 ROOT="$( cd -P "$( dirname "$SOURCE" )/../.." && pwd )"
 
+# Exit immediately for non zero status
 set -e
 set -u
 set -x