add 2way sync for helm formula

Helm formulas is currently only on gerrit and we should mirror it to
github as well.

Change-Id: If67a8cb68f128ae39d6579817c6252a841e41d49
diff --git a/jenkins/client/job/salt-formulas/git-mirrors/2way.yml b/jenkins/client/job/salt-formulas/git-mirrors/2way.yml
index 01c3baf..9665335 100644
--- a/jenkins/client/job/salt-formulas/git-mirrors/2way.yml
+++ b/jenkins/client/job/salt-formulas/git-mirrors/2way.yml
@@ -85,6 +85,8 @@
               branches: ${_param:salt_formulas_extra_branches}
             - name: heka
               branches: ${_param:salt_formulas_branches}
+            - name: helm
+              branches: ${_param:salt_formulas_branches}
             - name: horizon
               branches: ${_param:salt_formulas_extra_branches}
             - name: influxdb