fix: address changes requested by @vknabel

Author: mac641

cmd/metal-api/internal/service/image-service.go

@@ -358,20 +358,20 @@ func checkImageURL(id, inputURL string, ociCredentials authn.Authenticator) erro
 	case "http", "https":
 		_, err := url.ParseRequestURI(inputURL)
 		if err != nil {
-			return fmt.Errorf("image:%s could not be parsed. error:%w", inputURL, err)
+			return fmt.Errorf("image:%q could not be parsed, error:%w", inputURL, err)
 		}
 
 		res, err := http.Head(inputURL)
 		if err != nil {
-			return fmt.Errorf("image:%s is not accessible under:%s error:%w", id, inputURL, err)
+			return fmt.Errorf("image:%q is not accessible under:%s, error:%w", id, inputURL, err)
 		}
 		if res.StatusCode >= 400 {
-			return fmt.Errorf("image:%s is not accessible under:%s status:%s", id, inputURL, res.Status)
+			return fmt.Errorf("image:%q is not accessible under:%s, status:%s", id, inputURL, res.Status)
 		}
 	case "oci":
 		ref, err := name.ParseReference(parsedURL[1])
 		if err != nil {
-			return fmt.Errorf("image reference:%s could not be parsed. error:%w", inputURL, err)
+			return fmt.Errorf("image reference:%q could not be parsed, error:%w", inputURL, err)
 		}
 
 		if ociCredentials == nil {
@@ -380,10 +380,10 @@ func checkImageURL(id, inputURL string, ociCredentials authn.Authenticator) erro
 
 		_, err = remote.Image(ref, remote.WithAuth(ociCredentials))
 		if err != nil {
-			return fmt.Errorf("image:%s is not accessible under:%s error:%w", id, inputURL, err)
+			return fmt.Errorf("image:%q is not accessible under:%s, error:%w", id, inputURL, err)
 		}
 	default:
-		return fmt.Errorf("image:%s with url:%s has unkown protocol", id, inputURL)
+		return fmt.Errorf("image:%q with url:%s has unknown protocol", id, inputURL)
 	}
 
 	return nil