Allow ksonet type registry in an enterprise git

Out github is at github.intuit.com; Making this change allows ks to consider it a valid ksonet registry. We need this fix soon. In the long run I suggest a better detection method, such as uri connect to git or a helm service.
Signed-off-by: Omer Azmon <omer_azmon@intuit.com>

pkg/actions/registry_add.go

@@ -127,6 +127,6 @@ func (ra *RegistryAdd) protocol() (registryDetails, error) {
 }
 
 func (ra *RegistryAdd) isGitHub() bool {
-	return strings.HasPrefix(ra.uri, "github.com") ||
-		strings.HasPrefix(ra.uri, "https://github.com")
+	return strings.HasPrefix(ra.uri, "github") ||
+		strings.HasPrefix(ra.uri, "https://github")
 }