fix(views/kit): Export niv-pinned source hashes

These are required for standalone imports of the kit now.

Change-Id: Ie3c7218a606b1ba9cf274bb80b314a7889d8ede9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5189
Tested-by: BuildkiteCI
Autosubmit: tazjin <tazjin@tvl.su>
Reviewed-by: ezemtsov <eugene.zemtsov@gmail.com>

views/kit/default.nix

@@ -6,7 +6,12 @@
 # it simple. Adding it may be useful if we set up test scaffolding
 # around the exported workspace.
 
-{ pkgs ? import ./nixpkgs { depotOverlays = false; }, ... }:
+{ pkgs ? (import ./nixpkgs {
+    depotOverlays = false;
+    depot.third_party.sources = import ./sources { };
+  })
+, ...
+}:
 
 pkgs.lib.fix (self: {
   buildGo = import ./buildGo { inherit pkgs; };