deploymentmanifest.go
func (s *DeploymentManifest) AddTag(key, value string) {
	if s.Tags == nil {
		s.Tags = make(map[string]string)
	}
	s.Tags[key] = value
}
func (s *DeploymentManifest) AddTag(key, value string) {
	if s.Tags == nil {
		s.Tags = make(map[string]string)
	}
	s.Tags[key] = value
}
// AddTag adds a key-value pair to be sent to the CPI for VM tagging.
// This feature is available in bosh release v258+.
// https://bosh.io/docs/manifest-v2.html#tags