vscode-utils.buildVscodeExtension: support alternative installPhase and sourceRoot

        nativeBuildInputs ? [ ],

        passthru ? { },

        ...

      }:

      }@args:

      {

        pname = "vscode-extension-${pname}";

        # Some .vsix files contain other directories (e.g., `package`) that we don't use.

        # If other directories are present but `sourceRoot` is unset, the unpacker phase fails.

        sourceRoot = "extension";

        sourceRoot = args.sourceRoot or "extension";

        # This cannot be removed, it is used by some extensions.

        installPrefix = "share/vscode/extensions/${vscodeExtUniqueId}";

        nativeBuildInputs = [ unzip ] ++ nativeBuildInputs;

        installPhase = ''

        installPhase =

          args.installPhase or ''

            runHook preInstall

            mkdir -p "$out/$installPrefix"