exit main and execute defered statements

main.go

func main() {
	run := func() int {
		p := porter.New()
		defer p.Close()

		cmd := buildRootCommandFrom(p)
		if err := cmd.Execute(); err != nil {
			return 1
		}
		return 0
	}

	// Wrapping the main run logic in a function because os.Exit will not
	// execute defer statements
	os.Exit(run())
}