Build Windows Game Client in Cloud Build

[markmandel]

Follow on from #113, but this time, for Windows!

Some notes to keep track of:

• https://cloud.google.com/compute/docs/connect/windows-ssh (Seems like the easiest from Cloud Build)
• https://cloud.google.com/compute/docs/instances/windows/connecting-powershell (Might be an alternative)
• https://docs.unrealengine.com/5.2/en-US/building-unreal-engine-from-source/ (obvs)
• https://www.ansible.com/for/windows
• https://docs.unrealengine.com/4.26/en-US/ProductionPipelines/DeployingTheEngine/UsinganInstalledBuild/ (build from command line on Windows).
• https://github.com/RedpointGames/uet (scripting tool for installing Unreal)

I've set this up on GCE manually, but never automated a Windows GCE instance with software installation - so that will be the learning path (suggestions appreciated!)

[markmandel]

Had a great discussion with the Unreal Containers Discord Community, and they pointed out some amazing ideas:

• Orchestrate a windows container on GKE with a Windows Container host through Cloud Build (GENIUS! Way easier than running a single VM, and scalable!)
• BusyBox for Windows may be useful to simplify script automation https://frippery.org/busybox/index.html
• The Windows container will need to be built from source though - so that's... going to be fun to automate.
  • https://docs.unrealengine.com/4.27/en-US/SharingAndReleasing/Containers/HowTo/BuildingTheWindowsContainerImagesFromSource/

But the great benefit to this is that it can scale with the workload! Which is super nice.