Show errors on pgm startup

[giuliohome]

Describe the bug
Show the errors and not the command help if the arguments are missing or correct and the runtime throws.

To Reproduce
Steps to reproduce the behavior:

1. Stop your minikube (or whatever k8s you use)
2. Start murre
3. See the command help instead of the actual error

Expected behavior
The actual exception should be reported to the output: showing the command arguments help is misleading when there is no usage error in the command line itself!

[giuliohome]

At first sight, I'd guess the bug is here,

func Execute() error {
	return RootCmd.Execute()
}

and the correct way to do that is explained here:

if err := myCommand.Execute(); err != nil {
        // There was an error! Print the error message and exit. Or do whatever you'd like!
        // This includes errors like "invalid argument" etc.
	fmt.Println(err)
	os.Exit(1)
}