scheduling jobs with grpc images

Change-Id: I566f64366799a80bb82f3726bac647d941c1f8ff
diff --git a/Makefile b/Makefile
index 15a66ee..af7a30a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 # Makefile for testing JJB jobs in a virtualenv
-
 .PHONY: test clean
 
+SHELL = bash -e -o pipefail
 VENV_DIR      ?= venv-jjb
 JJB_VERSION   ?= 3.2.0
 JOBCONFIG_DIR ?= job-configs