You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: activity_install_nodepool_labelset_operator.go
    path of file: ./repos/pipeline/internal/cluster/clustersetup
    
    the code of the file until where you have to start completion: // Copyright Â© 2019 Banzai Cloud
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License 
    
func (a InstallNodePoolLabelSetOperatorActivity) Execute(ctx context.Context, input InstallNodePoolLabelSetOperatorActivityInput) error {
	var config struct {
		Configuration struct {
			// Labeler configuration
			Labeler struct {
				// ForbiddenLabelDomains holds the forbidden domain names, the labeler won't set matching labels
				ForbiddenLabelDomains []string `mapstructure:"forbiddenLabelDomains"`
			} `mapstructure:"labeler"`
		} `json:"configuration,omitempty"`
	}

	config.Configuration.Labeler.ForbiddenLabelDomains = a.config.ForbiddenDomains

	values, err := yaml.Marshal(config)
	if err != nil {
		return errors.Wrap(err, "failed to marshal NodePoolLabelSet operator config to yaml values")
	}

	err = a.helmService.InstallDeployment(
		ctx,
		input.ClusterID,
		a.config.Namespace,
		a.config.Charts.NodepoolLabelOperator.Chart,
		"npls",
		values,
		a.config.Charts.NodepoolLabelOperator.Version,
		true,
	)

	if err != nil {
		return errors.WithMessage(err, "installing NodePoolLabelSet operator failed")
	}

	return nil
}