There is such a drone but it uses up a lot of drone parts.

There is also an augment that automatically repairs your hull at the cost of reducing your scrap pickups.

Stores will still remain your main source of repairs.

Drone repairs 3-5 damage for 1 drone part. It is very useful in the last sector, when you cannot repair otherwise. Original game text:

Hull repair drone: Automatically repairs 3-5 damage to your hull. Drone part is consumed once it finishes. Power Req: 2.

Thanks, I didn't remember the numbers. Indeed, the drone is especially good when you have the drone recovery arm so you don't spend almost any parts on any other drones. That way you'll easily accumulate 20-30 drone parts during the game without ever having to buy them.

There's a Hull Repair Drone? Never saw such a thing once during my numerous playthroughs O.o