feat: image variants per image

internal/infrastructure/useCases/auditFailures.go

@@ -29,6 +29,9 @@ var failureReasons = []failureReason{
 	{image.ErrInvalidMergeRequest, "The merge request is not valid."},
 	{image.ErrMergeCopyMissing, "One of the copies no longer exists."},
 	{image.ErrMergeHashMismatch, "The images are not identical copies."},
+	{image.ErrSourceTooLarge, "The source image is too large to generate this variant."},
+	{image.ErrVariantSourceUnsupported, "Variants aren't generated for this format."},
+	{image.ErrVariantSourceUnreadable, "The source image can't be read, so this variant can't be generated."},
 	{image.ErrVariantExists, "A variant with that name already exists."},
 	{purge.ErrPurgeConflict, "The library changed since the preview. Review it again."},
 	{purge.ErrPurgeBusy, "A purge is already running."},