concourse.go
func (s *ConcoursePipeline) SetImageDefaults(platform, imagetype, repo string) {
	s.defaultPlatform = platform
	s.defaultImageType = imagetype
	s.defaultImageRepository = repo
}
func (s *ConcoursePipeline) SetImageDefaults(platform, imagetype, repo string) {
	s.defaultPlatform = platform
	s.defaultImageType = imagetype
	s.defaultImageRepository = repo
}
//SetImageDefaults setter