Update docker to use proxy:
PS C:\Users\Administrator> [Environment]::SetEnvironmentVariable("HTTP_PROXY", "http://localhost:3128", [EnvironmentVariableTarget]::Machine)
PS C:\Users\Administrator> Restart-Service docker
Restart Squid when updating whitelist
PS C:\Users\Administrator> Restart-Service squidsrv; docker pull hello-world
To do:
Document process: