How to make init with closure in Swift

Issue #526

public class Build: UsesXcodeBuild {
    public var arguments = [String]()
    
    public init(_ closure: (Build) -> Void = { _ in }) {
        closure(self)
    }
}

Use function builder

public class Workflow {
    public var workingDirectory: String = "."
    public let tasks: [Task]

    public init(@TaskBuilder builder: () -> [Task]) {
        self.tasks = builder()
        self.tasks.forEach { task in
            task.workflow = self
        }
    }

    public init(@TaskBuilder builder: () -> Task) {
        self.tasks = [builder()]
        self.tasks.forEach { task in
            task.workflow = self
        }
    }
}

public func run(@TaskBuilder builder: () -> [Task]) {
    let workflow = Workflow(builder: builder)
    workflow.run()
}

public func run(@TaskBuilder builder: () -> Task) {
    let workflow = Workflow(builder: builder)
    workflow.run()
}