kube: add target:: convenience field to Service

Change-Id: If69116d93b6074136a36d98973e1aa997e2ebbef
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1802
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/app/mailman-web/kube/mailman.libsonnet b/app/mailman-web/kube/mailman.libsonnet
index f3748a9..c75e3b0 100644
--- a/app/mailman-web/kube/mailman.libsonnet
+++ b/app/mailman-web/kube/mailman.libsonnet
@@ -162,7 +162,7 @@
 
 
     svcWeb: ns.Contain(kube.Service("web")) {
-        target_pod: app.web.spec.template,
+        target:: app.web,
         spec+: {
             # hax
             type: "LoadBalancer",