code: func (g *dockerConfigKeyProvider) Provide(image string) credentialprovider.DockerConfig {
  	// Read the contents of the google-dockercfg metadata key and
  	// parse them as an alternate .dockercfg
  	if cfg, err := credentialprovider.ReadDockerConfigFileFromUrl(dockerConfigKey, g.Client, metadataHeader); err != nil {
  		klog.Errorf("while reading 'google-dockercfg' metadata: %v", err)
  	} else {
  		return cfg
  	}
  
  	return credentialprovider.DockerConfig{}
  }
docs: // Provide implements DockerConfigProvider