Add support for Windows Server, version 2022

Status Update (2022-04-21)

The MR !3218 (merged) adding support for Windows Server 2022 has missed the %14.10 milestone.

I am working on merging it to the main branch. Once that is complete, you can download the version of the Runner with Win Server 2k22 support included directly from our package repository.

Overview

• Add support for Windows Server 2022

Implementation Tasks

1. Add ltsc2022 to support list for Docker executor
2. Create a new helper image based on ltsc2022-amd64 and build with CI
3. Run ltsc2022-amd64 tests on main, similar to 1903/1909

Following the process documented in https://docs.gitlab.com/runner/development/add-windows-version.html