Hi @chiller,
Sounds like what I went through a few days ago.
https://discourse.roots.io/t/build-error-with-windows-validation-error/22566
In Windows, Sage 10 requires you to work within WSL, the info received in my previous thread helped me get it working.
Not certain about how Docker will complicate this, perhaps someone else can weigh in or you will be able to figure it out after reading that other thread.