I'm trying to deploy build agents that are running Windows Server version 1709, which is shipped as Server Core only. This is great because it's faster and smaller which is perfect for a build agent. 

Unfortunately, the script that's used to install SSH relies on the Windows shell APIs to extract a ZIP file. This isn't a recommended way to extract ZIPs and it breaks on core. Expand-Archive is the right command to use instead.

Here's the image I'm using:

• offer WindowsServerSemiAnnual
• publisher MicrosoftWindowsServer
• sku Datacenter-Core-1709-smalldisk
• version latest

The bug is here: https://github.com/jenkinsci/azure-vm-agents-plugin/blob/1ca07d466f514b268016c4352ca077abe965eb46/src/main/resources/scripts/sshInit.ps1#L13