message: Step 1: don't restrict custom webpack config for sites
diff: @@ -175,20 +175,12 @@ fn setup_build(target: &Target) -> Result<(Command, PathBuf, Bundle), failure::E
  command.arg(format!("--wasm-binding={}", bundle.get_wasm_binding()));
  let custom_webpack_config_path = match &target.webpack_config {
  - Some(webpack_config) => match &target.site {
  - None => Some(PathBuf::from(&webpack_config)),
  - Some(_) => {
  - message::warn("Workers Sites does not support custom webpack configuration files");
  - None
  - }
  - },
  + Some(webpack_config) => Some(PathBuf::from(&webpack_config)),
  None => {
  - if target.site.is_none() {
  let config_path = PathBuf::from("webpack.config.js".to_string());
  if config_path.exists() {
  message::warn("If you would like to use your own custom webpack configuration, you will need to add this to your wrangler.toml:\nwebpack_config = \"webpack.config.js\"");
  }
  - }
  None
  }
  };
  