While Apple’s new Siri Shortcuts feature debuted at WWDC has been conspicuously missing from iOS 12 betas, the company now appears to be making it available as a separate app to select registered developers through its TestFlight program. The app, which is clearly the result of Apple’s 2017 acquisition of Workflow, will allow users to build automations that integrate with multiple iOS apps and can be launched with a single Siri voice command.…