Fix API repository object format missed (#31118) (#31132)

Backport #31118 by @lunny

Fix #31117

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

services/convert/repository.go

@@ -236,6 +236,7 @@ func innerToRepo(ctx context.Context, repo *repo_model.Repository, permissionInR
 		MirrorInterval:                mirrorInterval,
 		MirrorUpdated:                 mirrorUpdated,
 		RepoTransfer:                  transfer,
+		ObjectFormatName:              repo.ObjectFormatName,
 	}
 }