MAGECLOUD-2798: Build Reported Success even though di:compile is failed (#296)

Author: shiftedreality

.magento.app.yaml

@@ -78,6 +78,7 @@ mounts:
 hooks:
     # We run build hooks before your application has been packaged.
     build: |
+        set -e
         php ./vendor/bin/ece-tools build:generate
         php ./vendor/bin/ece-tools build:transfer
     # We run deploy hook after your application has been deployed and started.