Judging from the photo, I think it might not be bent to one side. It looks to me more like one side is bent inward and the other may be OK, or at least close. I'd start y measuring the rear dropout width and then adding spacers to bring the inside width up to 120mm or 126mm to the outside of the bent side, and seeing if it's close to centered.

Once you know, and given that it's a "saved from the scrap" frame, I'd do a rough align, based on 120 or 126 OLD whichever was closer. throw on some wheels, bar and seat and do a test ride coasting on a shallow slope. If it's close, I'd complete a build out and see what I had.

After the rough align, it might need some refining, but I think this frame could most definitely is worth a shot as long as I didn't have to gamble too much.