Ensure that validate.sh fails when `find` fails

[toelke]

When the producing command in a pipe fails, a script does not fail, even with errexit:

[...]
INFO - Validating clusters
find: './clusters': No such file or directory
INFO - Validating kustomize overlays
[...]
$ echo $?
0

With this change:

INFO - Validating clusters
find: './clusters': No such file or directory
$ echo $?
1

Signed-off-by: Philipp Riederer [email protected]