Factor FS to RegistryV1 code out of helm conversion

Signed-off-by: Per Goncalves da Silva <pegoncal@redhat.com>

Author: Per Goncalves da Silva

internal/rukpak/convert/registryv1.go

@@ -42,16 +42,24 @@ type Plain struct {
 }
 
 func RegistryV1ToHelmChart(ctx context.Context, rv1 fs.FS, installNamespace string, watchNamespaces []string) (*chart.Chart, error) {
+	reg, err := ParseFS(ctx, rv1)
+	if err != nil {
+		return nil, err
+	}
+	return toChart(reg, installNamespace, watchNamespaces)
+}
+
+func ParseFS(ctx context.Context, rv1 fs.FS) (RegistryV1, error) {
 	l := log.FromContext(ctx)
 
 	reg := RegistryV1{}
 	annotationsFileData, err := fs.ReadFile(rv1, filepath.Join("metadata", "annotations.yaml"))
 	if err != nil {
-		return nil, err
+		return reg, err
 	}
 	annotationsFile := registry.AnnotationsFile{}
 	if err := yaml.Unmarshal(annotationsFileData, &annotationsFile); err != nil {
-		return nil, err
+		return reg, err
 	}
 	reg.PackageName = annotationsFile.Annotations.PackageName
 
@@ -100,14 +108,14 @@ func RegistryV1ToHelmChart(ctx context.Context, rv1 fs.FS, installNamespace stri
 		}
 		return nil
 	}); err != nil {
-		return nil, err
+		return reg, err
 	}
 
 	if err := copyMetadataPropertiesToCSV(&reg.CSV, rv1); err != nil {
-		return nil, err
+		return reg, err
 	}
 
-	return toChart(reg, installNamespace, watchNamespaces)
+	return reg, nil
 }
 
 // copyMetadataPropertiesToCSV copies properties from `metadata/propeties.yaml` (in the filesystem fsys) into