/// <summary>
/// Perform initialisation steps common across all workflows.
/// </summary>
internal static IStepBuilder <TData, GetSourceFiles> Initialise <TData>(this IWorkflowBuilder <TData> builder)
where TData : WorkflowData
=> builder
.InitialiseUnderlayCache()
.InitialiseSatelliteRegistry()
.InitialiseGradient()
.GetSourceFiles();