fix: also show skip for non semver tags

cli/recipe/upgrade.go

@@ -220,7 +220,7 @@ You may invoke this command in "wizard" mode and be prompted for input:
 						tag := img.(reference.NamedTagged).Tag()
 						logrus.Warning(fmt.Sprintf("unable to determine versioning semantics of %s, listing all tags", tag))
 						msg = fmt.Sprintf("upgrade to which tag? (service: %s, tag: %s)", service.Name, tag)
-						compatibleStrings = []string{}
+						compatibleStrings = []string{"skip"}
 						for _, regVersion := range regVersions {
 							compatibleStrings = append(compatibleStrings, regVersion.Name)
 						}