code: func getFunctionArnVars(relations []ConfigRelation) (args []string) {
  	log.Debugf("Generating the tfvar apex_function_FUNCTION")
  	for _, rel := range relations {
  		args = append(args, "-var")
  		args = append(args, fmt.Sprintf("apex_function_%s=%s", rel.Function.Name, *rel.Configuration.FunctionArn))
  	}
  	return args
  }
docs: // Generate a series of variables apex_function_FUNCTION that contains the arn of the functions
  // This function is being phased out in favour of apex_function_arns