kube: add .volume field on PVCs and ConfigMaps

Change-Id: I93eec44bd6df4ecb0044a4797faa9bf6fd26802d
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1811
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/app/inventory/prod.jsonnet b/app/inventory/prod.jsonnet
index 4b9a150..080b931 100644
--- a/app/inventory/prod.jsonnet
+++ b/app/inventory/prod.jsonnet
@@ -29,7 +29,7 @@
       template+: {
         spec+: {
           volumes_: {
-            media: kube.PersistentVolumeClaimVolume(top.media),
+            media: top.media.volume,
           },
           containers_: {
             default: kube.Container('default') {