what is the base image for GitHub hosted runners for windows - server core or server?

[super-brian]

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Microsoft offers four types of base images: https://learn.microsoft.com/en-us/virtualization/windowscontainers/manage-containers/container-base-images I wonder what is the base image for GitHub hosted runners for windows. I need 'server' type.
This links has list of tools for the runners, and "Cached Docker images" has all server core base images. Actually, I am not quite sure what 'Cached Docker images' really means, too. It would be great if anyone could explain or post links for explanation.
https://github.com/actions/runner-images/blob/main/images/windows/Windows2022-Readme.md
Thank you!

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[nebuk89]

Hey! Our runners themselves are VMs not containers :) we so don't use any of these docker images :D
We do have some container images pre-cached on the VM as you highlight, this is just so if folks use them they don't have to wait for them to download on every job.

That said, you can pull more images also :) if you want to run in one of these images in particular, you could do this through container jobs