feat: image variants per image

internal/domain/image/variantRepositoryInterface.go

@@ -17,6 +17,7 @@ type VariantFileRepository interface {
 	ListBySource(sourceName string) ([]VariantFile, error)
 	Delete(id uint32) error
 	Totals() (map[string]VariantFileTotals, error)
+	TotalsBySource() (map[string]VariantFileTotals, error)
 }
 
 type RenderedVariant struct {