ci: break if no errors on build

No wonder why the build has been taking longer... We were building 3
times.
We just got at least 2 minutes back of build time thanks to this fix.

Signed-off-by: Sébastien Han <seb@redhat.com>

tests/scripts/github-action-helper.sh

@@ -113,6 +113,8 @@ function build_rook() {
           # valid failure
           exit 1
       esac
+      # no errors so we break the loop after the first iteration
+      break
     fi
   done
   # validate build