message: init-registry: registries can only be created at the root of a git repository
diff: @@ -18,8 +18,17 @@ namespace vcpkg::Commands::InitRegistry
  {
  auto parsed_args = args.parse_arguments(COMMAND_STRUCTURE);
  - auto path = vcpkg::u8path(args.command_arguments.front());
  - path = combine(fs.current_path(VCPKG_LINE_INFO), path);
  + const auto path_argument = vcpkg::u8path(args.command_arguments.front());
  + const auto path = combine(fs.current_path(VCPKG_LINE_INFO), path_argument);
  + if (!fs.exists(path / vcpkg::u8path(".git")))
  + {
  + vcpkg::printf(Color::error,
  + "Could not create registry at %s because this is not a git repository root.\n"
  + "Use `git init %s` to create a git repository in this folder.\n",
  + u8string(path),
  + u8string(path_argument));
  + Checks::exit_fail(VCPKG_LINE_INFO);
  + }
  const auto ports = path / vcpkg::u8path("ports");
  const auto baseline = path / vcpkg::u8path("versions") / vcpkg::u8path("baseline.json");
  if (!fs.exists(ports))
  