The "every job uses a Docker container" is what worries me. Because the other two certainly don't have a robust container mechanism. Sure, Windows has something

The "every job uses a Docker container" is what worries me. Because the other two certainly don't have a robust container mechanism. Sure, Windows has something, but it is a far cry from "pick a distro, install some stuff, and call it a day" because there's some blessed image that supports installing .NET stuff and if you don't base on that, you're SoL (at least last I checked). And that's even ignoring the lack of rendering if you need it or the filesystem performance hit they seemed to be plagued with.