Docker on Windows is a shim for the Windows Jobs API, as Microsoft decided to offer the same experience instead of coming up with their own set of tooling.
In more recent Windows versions, there are other ways to manage containers, specially after containerd support improved.
The best way to distribute builds on Windows is via incredible and their VS integration.
Cross compilation never really quite works out, unless one can have a complete set of libraries and toolset of the host OS, otherwise there will always be corner cases.
Python has been quite alright when using distributions like ActiveState Python.
Git, well one cannot expect better from a SCM designed for the Linux kernel project in first place.