fix: add flags to ensure that build aborts if there are errors

scripts/example.sh

@@ -1,3 +1,10 @@
 #!/bin/bash
+
+# Tell this script to exit if there are any errors.
+# You should have this in every custom script, to ensure that your completed
+# builds actually ran successfully without any errors!
+set -ouex pipefail
+
+# Your code goes here.
 echo 'This is an example shell script'
 echo 'Scripts here will run during build if specified in recipe.yml'