orm: ensure migrations table exist

create new one if it's missing

Signed-off-by: Seongmin Lee <[e-mail]>

orm/orm.go

···
 	}
 	defer tx.Rollback()
 
+	_, err = tx.Exec(`
+		create table if not exists migrations (
+			id integer primary key autoincrement,
+			name text unique
+		);
+	`)
+	if err != nil {
+		return fmt.Errorf("creating migrations table: %w", err)
+	}
+
 	var exists bool
 	err = tx.QueryRow("select exists (select 1 from migrations where name = ?)", name).Scan(&exists)
 	if err != nil {