aws-alb-fargate Docs/Examples?

[miles-po]

aws-alb-fargate is sufficiently different from the main CDK API on Fargate and ALBs that it's not clear how to actually use it. The props appear to be subsets needed by the constituent parts. An example would be greatly appreciated, especially one that includes building from an asset, eg.

    const asset = new DockerImageAsset(this, 'MyFargateAsset', {
      directory: 'django',
      file: 'Dockerfile',
    });