The vegetarian gravy is gluten free (as are a limited amount of biscuits daily). I cannot say if either of those contain dairy (though I suspect the biscuit certainly does), so whether or not the gravy is vegan is the real question.
A guy there told me straight up they often get questions about vegan items (maybe because they have Vegetarian & GF?) They don't list any and their biscuits aren't vegan. So, I'd say no.... But calling them versus this medium would be the 100% sure answer. They do have GF shitake mushroom gravy but you would need to call to see if it is also vegan.
Thanks! Your answer is awaiting moderation.