fix(crate2nix): reimplement overrideAttrs properly

build.nix

@@ -164,17 +164,22 @@ else if lib.isCrate2Nix buildPlatform then
                   [ "--no-default-features" "--features" (lib.concatStringsSep " " config.rootFeatures) ];
             } // (builtins.removeAttrs config [ "runTests" ])
           );
+        package = pkg.override { inherit (config) runTests; };
+        mkJoin = package: pkgs.symlinkJoin {
+          inherit (common) meta;
+          name = "${pkgName}-${cargoPkg.version}";
+          paths = [ package ];
+        };
+        mkJoinWithOv = package: (mkJoin package) // {
+          overrideAttrsTop = (mkJoin package).overrideAttrs;
+        };
       in
       # This is a workaround so that crate2nix doesnt get built until we actually build
         # otherwise nix will try to build it even if you only run `nix flake show`
         # https://github.com/NixOS/nix/issues/4265
-        # TODO: probably provide a way to override the inner derivation?
-      pkgs.symlinkJoin {
-        inherit (common) meta;
-        name = "${pkgName}-${cargoPkg.version}";
-        paths = [
-          (pkg.override { inherit (config) runTests; })
-        ];
+      (mkJoinWithOv package) // {
+        overrideAttrs = f: mkJoinWithOv (package.overrideAttrs f);
+        override = attrs: mkJoinWithOv (package.override attrs);
       };
   }
 else if lib.isBuildRustPackage buildPlatform then