Deploy a Rails App to Fly.io and Get Preview Environments for Every Pull Request

Using Fly.io and GitHub Actions, you can automatically build isolated preview environments with PostgreSQL for every PR in your Rails app. This guide covers deployment to the Tokyo region (nrt) and the full GitHub Actions workflow setup.

Deploy a Rails App to Railway and Get Preview Environments for Every Pull Request

Using Railway's PR Preview Environments, you can automatically build isolated preview environments with PostgreSQL for every PR in your Rails app. It only requires a single railway.json file and Dashboard configuration — no GitHub Actions needed.