Controversial opinion: ignore it and keep building.

This happened to me years ago when a Russian website copied a website I was running. We had an API that helped them get not just the design, but the data.

Google is pretty smart (sometimes) about figuring out content of origin. If you already have an established site with links pointing in your should be fine. If you're new and you're entire business can be copied that quickly, you have likely larger problems than SEO at this point.