title: Build Docker container with .NET 3.5 and 4.8 SDK?
body: <p>Can't seem to find any resource on how to have both .NET versions, 3.5 and 4.8 installed into a docker container.</p>
  <p>I am currently using:</p>
  <pre><code>FROM mcr.microsoft.com/dotnet/framework/sdk:4.8-windowsservercore-ltsc2019
  </code></pre>
  <p>as my base image. But would also want .NET 3.5 for backwards compatibility. My attempts using their .NET 3.5 <a href="https://hub.docker.com/_/microsoft-dotnet-framework-sdk/" rel="nofollow noreferrer">dockerfile</a> to build but with the above base image have failed. This is for CICD purposes, creating a build environment.</p>