[Container build] raise Exception post logging error

Currently it catches SystemError and log error message
but do not fail, raise SystemError so it fails too.

Closes-Bug: #1905348
Change-Id: I2e823c58779dba529a58aff5e0e1c0c880c267aa

tripleoclient/v2/tripleo_container_image.py

@@ -658,6 +658,7 @@ class Build(command.Command):
                 self.log.error(
                     "Buildah failed with the following error: {}".format(exp)
                 )
+                raise SystemError(exp)
 
 
 class HotFix(command.Command):