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/matrix/lib/cas.libsonnet b/app/matrix/lib/cas.libsonnet
index 1a33aaa..f1de4fe 100644
--- a/app/matrix/lib/cas.libsonnet
+++ b/app/matrix/lib/cas.libsonnet
@@ -43,6 +43,6 @@
     },
 
     svc: app.ns.Contain(kube.Service("oauth2-cas-proxy")) {
-        target_pod:: app.deployment.spec.template,
+        target:: app.deployment,
     },
 }