Run an app on fly.io

First create a fly account on fly.io and install flyctl on your system fly.io/docs/hands-on/install-flyctl/ (on macOS, use brew install flyctl)

Then run fly auth login to login

Go in your project folder and add a Dockerfile if you don’t have already one.

Then run fly launch (select a region that’s free) and fly deploy --ha=false to create a single-instance free service.