add additional helm repo needed for storage charts to build

Change-Id: Iabe50c452912e2cb3b5b4213fae76c9fed5f54cb
diff --git a/jjb/charts.yaml b/jjb/charts.yaml
index 63444cd..b8c74a9 100644
--- a/jjb/charts.yaml
+++ b/jjb/charts.yaml
@@ -51,6 +51,7 @@
     builders:
       - shell: |
           #!/usr/bin/env bash
+          set -eu -o pipefail
 
           # Set up the ssh host keys for the docs host
           mkdir -p ~/.ssh
@@ -59,6 +60,7 @@
           # Setup and build the helm repo
           helm init --client-only
           helm repo add incubator https://kubernetes-charts-incubator.storage.googleapis.com/
+          helm repo add rook-beta https://charts.rook.io/beta
           ./scripts/helmrepo.sh
 
           # Copy repo to host