Learn recursive updates

Turns out `//` is more destructive than I thought. With it,
I was wiping `metadata` of everything but the `namespace` key.

lib/app-template.nix

@@ -1,6 +1,7 @@
 {
   charts,
   kubelib,
+  pkgs,
   vars,
 }: rec {
   mkMainImage = repository: tag: {
@@ -58,11 +59,12 @@
       inherit name namespace;
       chart = charts.bjw-s.app-template;
       values =
-        configVolume
-        // httpRoute
-        // extraValues
-        // {
-          controllers.main.containers.main.image = mainImage;
-        };
+        pkgs.lib.attrsets.recursiveUpdate
+        (configVolume
+          // httpRoute
+          // {
+            controllers.main.containers.main.image = mainImage;
+          })
+        extraValues;
     };
 }

lib/default.nix

@@ -5,7 +5,7 @@
 }: let
   vars = import ./vars.nix;
 in
-  (import ./app-template.nix {inherit charts kubelib vars;})
+  (import ./app-template.nix {inherit charts kubelib pkgs vars;})
   // (import ./builders.nix {inherit pkgs;})
   // vars
   // {
@@ -41,5 +41,5 @@ in
     # Non-namespaced objects can have `metadata.namespace` set, too;
     # it's ignored upon their creation.
     setNsOnObjects = namespace: input:
-      map (obj: obj // {metadata.namespace = namespace;}) input;
+      map (obj: pkgs.lib.attrsets.recursiveUpdate obj {metadata.namespace = namespace;}) input;
   }