git-annex: do not block database in doArchive

This commit can be dropped as soon as
go-gitea#27563 is accepted.

services/repository/archiver/archiver.go

@@ -278,6 +278,13 @@ func doArchive(ctx context.Context, r *ArchiveRequest) (*repo_model.RepoArchiver
 	// TODO: add lfs data to zip
 	// TODO: add submodule data to zip
 
+	// commit and close here to avoid blocking the database for the entirety of the archive generation process (might only be an issue with sqlite)
+	err = committer.Commit()
+	if err != nil {
+		return nil, err
+	}
+	committer.Close()
+
 	if _, err := storage.RepoArchives.Save(rPath, rd, -1); err != nil {
 		return nil, fmt.Errorf("unable to write archive: %w", err)
 	}
@@ -287,6 +294,14 @@ func doArchive(ctx context.Context, r *ArchiveRequest) (*repo_model.RepoArchiver
 		return nil, err
 	}
 
+	txCtx, committer, err = db.TxContext(db.DefaultContext)
+	if err != nil {
+		return nil, err
+	}
+	defer committer.Close()
+	ctx, _, finished = process.GetManager().AddContext(txCtx, fmt.Sprintf("ArchiveRequest[%d]: %s", r.RepoID, r.GetArchiveName()))
+	defer finished()
+
 	if archiver.Status == repo_model.ArchiverGenerating {
 		archiver.Status = repo_model.ArchiverReady
 		if err = repo_model.UpdateRepoArchiverStatus(ctx, archiver); err != nil {