My recent diagnosis made it so I have to ask about GF offerings every single time we go out (which isn't often anymore - it's so much easier to cook at home).
However, I scoured the internet and RC's GF offerings look absolutely delightful and they will include GF buns, etc. at no charge (which is AMAZING!) You just have to tell them ahead of time if you have any allergies. I noted with a CS rep that I am gluten free and I am probably going to wear a "is this gluten free?" shirt on my first night so our servers know what's up 😄