How do you move a sinatra app to github pages?

I created a sinatra app and I'm trying to put it on github pages. I can run my app on localhost, but I don't know how to push it to the actual web.

I have tried googling and searching stackoverflow and I keep seeing people use heroku. Is this required? Is there anyway to push directly from sinatra to the web? I can get a simple index.html file to run on github pages, but I don't know how to get my sinatra app to run. Any help would be great.