message: docs: document new build target
diff: @@ -289,7 +289,7 @@ The fourth cache behaviour handles next API requests `api/*`.
  ### Inputs
  | Name | Type | Default Value | Description |
  -| -------------------- | ----------------- | ------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  +| ------------------------ | ----------------- | ------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | domain | `Array` | `null` | For example `['admin', 'portal.com']` |
  | bucketName | `string` | `null` | Custom bucket name where static assets are stored. By default is autogenerated. |
  | nextConfigDir | `string` | `./` | Directory where your application `next.config.js` file is. This input is useful when the `serverless.yml` is not in the same directory as the next app. <br>**Note:** `nextConfigDir` should be set if `next.config.js` `distDir` is used |
  @@ -305,6 +305,7 @@ The fourth cache behaviour handles next API requests `api/*`.
  | build.env | `object` | `{}` | Add additional environment variables to the script |
  | cloudfront | `object` | `{}` | Inputs to be passed to [aws-cloudfront](https://github.com/serverless-components/aws-cloudfront) |
  | publicDirectoryCache | `boolean\|object` | `true` | Customize the `public`/`static` folder asset caching policy. Assigning an object with `value` and/or `test` lets you customize the caching policy and the types of files being cached. Assigning false disables caching |
  +| useServerlessTraceTarget | `boolean` | `false` | Use the experimental-serverless-trace target to build your next app. This is the same build target that Vercel Now uses. See this [RFC](https://github.com/vercel/next.js/pull/8246) for details. |
  Custom inputs can be configured like this:
  