Apply SDL validation task on windows-amd64 outputs

[dagood]

Building for windows-amd64 is tracked by #27.
Applying SDL tasks is WIP on an internal branch, as of writing.

I'm preemptively filing this issue to track the combination of the two: make sure the windows-amd64 assets are processed properly by the SDL tasks. There may be different requirements/issues that come up for Windows vs. Linux.