How do you get consistent snapshot testing across environments?

[RVledder]

In our project, we're using snapshot testing. However, some devs are running Windows, some are running OSX and the CI is using Linux. Rendering the snapshots could be different on either one of the environments. (fonts, shadow rendering)

How do you solve this issue?

What we're currently doing is running Docker with Linux locally to match the CI. But it feels a bit odd to be having to use Linux, a system that our user base doesn't use. Also we're currently experiencing an issue with running Docker locally, which raises this question, why use Docker at all for this.