gcloud: move package hacks ot its own module

pkgs/gcloud-wrapped/default.nix

@@ -0,0 +1,23 @@
+{ buildGoModule, pkgs }:
+let
+  gcloud-wrapper = buildGoModule {
+    name = "gcloud-wrapper";
+    src = ./.;
+    vendorHash = null;
+  };
+in
+pkgs.symlinkJoin {
+  name = "google-cloud-sdk-wrapped";
+  paths = [ pkgs.google-cloud-sdk ];
+  nativeBuildInputs = [ pkgs.makeWrapper ];
+  postBuild = ''
+    # Remove the original gcloud symlink
+    rm $out/bin/gcloud
+
+    # Create a shell wrapper called gcloud-wrapped that executes the real gcloud
+    makeWrapper ${pkgs.google-cloud-sdk}/bin/gcloud $out/bin/gcloud-wrapped
+
+    # Replace gcloud with our caching wrapper
+    ln -s ${gcloud-wrapper}/bin/gcloud-wrapper $out/bin/gcloud
+  '';
+}

pkgs/gcloud-wrapper/default.nix

@@ -1,6 +0,0 @@
-{ buildGoModule }:
-buildGoModule {
-  name = "gcloud-wrapper";
-  src = ./.;
-  vendorHash = null;
-}