compile varnish tmpl from docker-entrypoint script

also updates kubernetes resources to separate app & varnish into two different deployments

.kubernetes/2-config-varnish.yml

@@ -0,0 +1,9 @@
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: varnish-config
+  namespace: ${NAMESPACE}
+data:
+  PROXY_HOST: ${PROXY_HOST}
+  IMAGE_HOST: ${IMAGE_HOST}