var definition = new WorkflowDefinitionBuilder()
    .WithName("fake-workflow")
    .WithVersion("0.1.0:fake")
    .Do("todo-1", task => task
        .Call("http")
        .With("method", "get")
        .With("uri", "https://fake-api.com"))
    .Build();

using var inputStream = File.OpenRead("workflow.yaml");
var reader = WorkflowDefinitionReader.Create();
var workflow = await reader.ReadAsync(inputStream);
using var outputStream = File.Create("workflow.yaml");
var writer = WorkflowDefinitionWriter.Create();
await writer.WriteAsync(workflow, stream, WorkflowDefinitionFormat.Yaml);