Sign exclusively via sigstore-go for sign-blob

Signed-off-by: Aaron Lew <64337293+aaronlew02@users.noreply.github.com>

Author: aaronlew02

cmd/cosign/cli/options/key.go

@@ -27,6 +27,7 @@ type KeyOpts struct {
 	KeyRef               string
 	FulcioURL            string
 	RekorURL             string
+	RekorVersion         uint32
 	IDToken              string
 	PassFunc             cosign.PassFunc
 	OIDCIssuer           string

cmd/cosign/cli/options/rekor.go

@@ -20,10 +20,12 @@ import (
 )
 
 const DefaultRekorURL = "https://rekor.sigstore.dev"
+const DefaultRekorVersion = 1
 
 // RekorOptions is the wrapper for Rekor related options.
 type RekorOptions struct {
-	URL string
+	URL     string
+	Version uint32
 }
 
 var _ Interface = (*RekorOptions)(nil)
@@ -32,4 +34,6 @@ var _ Interface = (*RekorOptions)(nil)
 func (o *RekorOptions) AddFlags(cmd *cobra.Command) {
 	cmd.Flags().StringVar(&o.URL, "rekor-url", DefaultRekorURL,
 		"address of rekor STL server")
+	cmd.Flags().Uint32Var(&o.Version, "rekor-version", DefaultRekorVersion,
+		"version of rekor API")
 }