title: .NET Core SDK vs Runtime version for Docker
body: <p>I'm building an ASP.NET Core 2.0 app. My machine is running what I believe is the latest SDK and runtime: <code>2.0.0-preview2-006497-preview2</code></p>
  
  <pre><code>$ dotnet --version
  2.0.0-preview2-006497
  </code></pre>
  
  <p>However, when I build and attempt to run a Docker image, I am getting:</p>
  
  <pre><code>It was not possible to find any compatible framework version
  The specified framework 'Microsoft.NETCore.App', version '2.0.0-preview2-25407-01' was not found.
    - Check application dependencies and target a framework version installed at:
        /
    - Alternatively, install the framework version '2.0.0-preview2-25407-01'.
  </code></pre>
  
  <p>If I run the base Docker image directly, I discover that it is reporting version <code>2.0.0</code> (no preview) as the version:</p>
  
  <pre><code>$ sudo docker run -it microsoft/aspnetcore-build:2.0
  root@523a779f7167:/# dotnet --version
  2.0.0
  </code></pre>
  
  <p>I don't get it. 2.0.0 hasn't RTMed, has it? I can't find any information about that anywhere online, but I also can't find Docker base images for preview2.</p>