prow/spyglass/gcsartifact.go
func (a *GCSArtifact) gzipped() (bool, error) {
	attrs, err := a.handle.Attrs(a.ctx)
	if err != nil {
		return false, fmt.Errorf("error getting gcs attributes for artifact: %v", err)
	}
	return attrs.ContentEncoding == "gzip", nil
}
func (a *GCSArtifact) gzipped() (bool, error) {
	attrs, err := a.handle.Attrs(a.ctx)
	if err != nil {
		return false, fmt.Errorf("error getting gcs attributes for artifact: %v", err)
	}
	return attrs.ContentEncoding == "gzip", nil
}
// gzipped returns whether the file is gzip-encoded in GCS