fix: include reference string in invalid reference format error (#1303)

When NewRepository fails to parse an image reference, log the actual
reference string that failed validation. This makes it possible to
identify which image reference is causing the "invalid reference format"
error.

Previously, users would see:
  Could not get tags from registry: invalid reference format

Now users will see:
  Failed to create repository for image 'invalid@reference': invalid reference format

This provides the necessary context to debug configuration issues with
malformed image references.

Fixes #1303

Signed-off-by: Ellis Valentiner <[email protected]>

Author: ellisvalentiner

registry-scanner/pkg/registry/registry.go

@@ -44,6 +44,7 @@ func (ep *RegistryEndpoint) GetTags(ctx context.Context, img *image.ContainerIma
 	}
 	err = regClient.NewRepository(nameInRegistry)
 	if err != nil {
+		logCtx.Errorf("Failed to create repository for image '%s': %v", nameInRegistry, err)
 		return nil, err
 	}
 	tTags, err := regClient.Tags(ctx)