Using `force:user:create` in a flow

cumulusci.yml

tasks:
    create_special_user:
        class_path: cumulusci.tasks.sfdx.SFDXOrgTask
        options:
            command: "force:user:create  --definitionfile datasets/users/user-special.json"
            
flows:
    config_dev:
        steps:
            3:
                task: create_special_user

user-special.json

{
    "LastName": "John",
    "FirstName": "Smith",
    "Email": "sample@sfdx.org",
    "Alias": "Jsmith",
    "TimeZoneSidKey": "America/Denver",
    "LocaleSidKey": "en_US",
    "EmailEncodingKey": "UTF-8",
    "LanguageLocaleKey": "en_US",
    "profileName": "Standard Platform User",
    "permsets": ["Special", "Dreamhouse"],
    "generatePassword": true
}