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Add support for Windows 24H2

Martin Blecker requested to merge AdrianDeWinter/gitlab-runner:add-windows-server-2025-support into main
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What does this MR do?

Adds support for running jobs with the docker-windows executor on Windows Server 2025 and Windows 11 24H2.

This MR takes advantage of the down-level compatibility in newer Windows versions by re-using the existing 21H2 helper images.

I have presumed the existence of a runner tagged windows-24h2, since even (or especially) with re-using the 21H2 image,
running integration tests against 24H2 seemed advisable. That is, however, very much just a suggestion,
and I'm happy to change the tag or throw these test jobs out entirely.

Why was this MR needed?

Since no helper image is mapped to the 24H2 build number, the runner currently reports a windows.ErrUnsupportedWindowsVersion on 24H2.
See #38246

What's the best way to test this MR?

  • Install gitlab-runner on Windows Server 2025 or Windows 11 24H2
  • Configure a runner with the docker-windows executor
  • Run any job on this runner

What are the relevant issue numbers?

Closes #38316, #38246

Edited by Martin Blecker

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