Fix missing repository id when migrating release attachments (#36389) (#36413)

This PR fixes missed repo_id on the migration of attachments to Gitea.
It also provides a doctor check to fix the dirty data on the database.

Backport #36389

services/migrations/gitea_uploader.go

@@ -320,6 +320,7 @@ func (g *GiteaLocalUploader) CreateReleases(ctx context.Context, releases ...*ba
 			}
 			attach := repo_model.Attachment{
 				UUID:          uuid.New().String(),
+				RepoID:        g.repo.ID,
 				Name:          asset.Name,
 				DownloadCount: int64(*asset.DownloadCount),
 				Size:          int64(*asset.Size),