Have you had experience automating the process of building and publishing applications using Fastlane?

Fastlane is a tool for automating the building, testing, and publishing of iOS applications. It allows you to set up a chain of actions (lane), which can include building the project, running tests, taking screenshots, uploading to the App Store, and other tasks.

Experience with Fastlane typically includes:

• Creating a Fastfile with descriptions of lanes.
• Setting up automatic building and signing of the application.
• Automating uploads to TestFlight or the App Store.

An example of a simple lane for building and uploading:

lane :release do
  build_app(scheme: "MyApp")
  upload_to_app_store
end

This significantly reduces the time and lowers the chance of errors during app publication.