Generate 20H2 image

What does this MR do?

Releases a 20H2 image

Why was this MR needed?

To support gitlab-org/gitlab-runner#27220 (closed)

What's the best way to test this MR?

• Having the right tools installed (gitlab-runner-helper 20H2 image tag, the following commands work: git --version, git lfs --version, pwsh --version)
• Can do a Git clone (git clone https://gitlab.com/gitlab-org/gitlab-runner.git)
• Runs on a Windows 20H2 machine

Run CI job using Windows 20H2 runner

1. Create windows 20H2 VM on GCP:

   gcloud compute instances create ppombeiro-20h2 --image https://www.googleapis.com/compute/v1/projects/windows-cloud/global/images/windows-server-20h2-dc-core-v20210511

2. Install Docker

3. RDP inside of the machine

4. Use binary published in https://gitlab-runner-downloads.s3.amazonaws.com/pedropombeiro/27220/add-windows-2009-support/index.html.

   Invoke-WebRequest -UseBasicParsing -OutFile gitlab-runner.exe https://gitlab-runner-downloads.s3.amazonaws.com/pedropombeiro/27220/add-windows-2009-support/binaries/gitlab-runner-windows-amd64.exe

5. Register runner

   .\gitlab-runner register --executor "docker-windows" --url "https://gitlab.com/" --description "docker-20H2-runner" --tag-list "docker,20H2,gitlab.com" --locked="false" --access-level="not_protected" --registration-token="$TOKEN" --non-interactive --docker-image mcr.microsoft.com/windows/servercore:20H2

6. Start runner

   .\gitlab-runner run

What are the relevant issue numbers?

gitlab-org/gitlab-runner#27220 (closed)