title: No Docker image for .NET Framework 4.6 SDK
body: <p>When I look at the versions of the Docker image mcr.microsoft.com/dotnet/framework/sdk on Docker Hub, I only see versions 3.5 and 4.8 are present. Why is it so?</p>
  <p>I tried running <code>docker pull mcr.microsoft.com/dotnet/framework/sdk:4.6</code> but no luck.</p>
  <p>Does this mean I need to upgrade my project to the .NET Framework 4.8 SDK?</p>