Workflow RO Crate profile example does not appear to comply with the profile

[ptsefton]

The example crate does not contain an entity of @type ["File", "SoftwareSourceCode", "ComputationalWorkflow"]

Thought the profile here https://about.workflowhub.eu/Workflow-RO-Crate/ says it should

the Main entity does not have @type computational workflow:

    {
      "@id": "example_workflow.cwl",
      "@type": [
        "File",
        "SoftwareSourceCode",
        "HowTo"
      ],
      "programmingLanguage": {
        "@id": "https://w3id.org/workflowhub/workflow-ro-crate#cwl"
      },
      "name": "Example Workflow",
      "image": {
        "@id": "diagram.svg"
      }
    },