Fix bug of migrated repository not index (#16991) (#16996)

Fix #16986, #16152

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

modules/task/migrate.go

@@ -93,7 +93,6 @@ func runMigrateTask(t *models.Task) (err error) {
 	}
 
 	opts.MigrateToRepoID = t.RepoID
-	var repo *models.Repository
 
 	ctx, cancel := context.WithCancel(graceful.GetManager().ShutdownContext())
 	defer cancel()
@@ -107,7 +106,7 @@ func runMigrateTask(t *models.Task) (err error) {
 		return
 	}
 
-	repo, err = migrations.MigrateRepository(ctx, t.Doer, t.Owner.Name, *opts, func(format string, args ...interface{}) {
+	t.Repo, err = migrations.MigrateRepository(ctx, t.Doer, t.Owner.Name, *opts, func(format string, args ...interface{}) {
 		message := models.TranslatableMessage{
 			Format: format,
 			Args:   args,
@@ -118,7 +117,7 @@ func runMigrateTask(t *models.Task) (err error) {
 		_ = t.UpdateCols("message")
 	})
 	if err == nil {
-		log.Trace("Repository migrated [%d]: %s/%s", repo.ID, t.Owner.Name, repo.Name)
+		log.Trace("Repository migrated [%d]: %s/%s", t.Repo.ID, t.Owner.Name, t.Repo.Name)
 		return
 	}