People underestimate the size of a 6 quarts tub especially for a hognose they also often do not realise are tiny a 12 grams snake really is.
To give you some perspective I took some pictures of an actual 6 quarts tub and a 12 grams hatchling female hognose and I also did the same with a 120 grams female hognose (so 10 times the size), you will also see a quarter for size reference.
Your 6 quarts tub will last your for a year or more depending on whether you are feeding your hognose adequately or not, at a year a female should be about 75 grams at that time depending on how well she feeds she will do fine in a 10 gallons or if you want to save money in a 12 or 15 quarts tub. Once she is around 200 grams she will be ready for her final enclosure a 20 gallons tank.
When you buy your 6 quarts tub I will also advice to buy a 2.7 quarts
tub l just in case, because if you have feeding issue downsizing will be your first step. (1 of them at walmart will be around $3.00 while your 6 quarts tub will be from $1.00 to $3.00)
As for regulating heat it’s like in a tank you use a heat mat, I will recommend
Ultraterm as they are more sturdy and can be moved from one enclosure to another) and a reliable thermostat, you want to cover 1/4 to 1/3 of the tub. This one will work now and on your permanent enclosure in the future.
While you have room to provide a hide (6 inch plastic flower pot saucer), it will be unnecessary, Hognose do not use hides what they need however is 2 inches of the adequate substrate (aspen) that will allow them to do what is natural for them digging and bury themselves.