move generator jobs into pkgs

pkgs/generators/default.nix

@@ -0,0 +1,45 @@
+{
+  pkgs,
+  lib,
+}: let
+  generateIstio = import ./istio {
+    inherit
+      pkgs
+      lib
+      ;
+  };
+
+  generateK8S = name: spec:
+    import ./k8s {
+      inherit
+        name
+        pkgs
+        lib
+        spec
+        ;
+    };
+in {
+  istio = pkgs.linkFarm "istio-generated" [
+    {
+      name = "latest.nix";
+      path = generateIstio;
+    }
+  ];
+
+  k8s = pkgs.linkFarm "k8s-generated" (
+    builtins.attrValues (
+      builtins.mapAttrs (
+        version: sha: let
+          short = builtins.concatStringsSep "." (lib.lists.sublist 0 2 (builtins.splitVersion version));
+        in {
+          name = "v${short}.nix";
+          path = generateK8S "v${short}" (builtins.fetchurl {
+            url = "https://github.com/kubernetes/kubernetes/raw/v${version}/api/openapi-spec/swagger.json";
+            sha256 = sha;
+          });
+        }
+      )
+      (import ../../versions.nix).full
+    )
+  );
+}