> In particular, the 'correct way to solve this problem is to stand up an environment for your PR and structure your CI so you only re-run the parts that affect the particular change you want to make, rather than re-running the entire pipeline. It involves putting more thought into running your pipeline but often means the only tasks that get executed are copying a file and restarting your app

This is actually exactly what our platform helps with - instead of micromanaging this (and updating the configurations) you can rely on a friendly SaaS to do it for you.

I wouldn't call us "better" than Docker, we're more like "Take Docker and make it work better for CI/CD and staging servers"