chore: remove unuse untar option

Signed-off-by: Abirdcfly <fp544037857@gmail.com>

pkg/getter/getter.go

@@ -35,7 +35,6 @@ type options struct {
 	certFile              string
 	keyFile               string
 	caFile                string
-	unTar                 bool
 	insecureSkipVerifyTLS bool
 	username              string
 	password              string
@@ -115,12 +114,6 @@ func WithRegistryClient(client *registry.Client) Option {
 	}
 }
 
-func WithUntar() Option {
-	return func(opts *options) {
-		opts.unTar = true
-	}
-}
-
 // WithTransport sets the http.Transport to allow overwriting the HTTPGetter default.
 func WithTransport(transport *http.Transport) Option {
 	return func(opts *options) {