Install .NET 6 SDK during build (required for running MSBuild integration tests)

Author: ap0llo

build.ps1

@@ -4,8 +4,9 @@ if ($env:TF_BUILD) {
     Write-Host "##[group]Install .NET SDK"
 }
 
-# Install .NET 6 runtime (requried for running tests on this platform)
-./build/dotnet-install.ps1 -Channel 6.0 -Runtime dotnet
+# Install .NET 6 SDK (required for running tests on this platform)
+# The MSBuild Integration tests require the SDK to be present, so just installing the runtime is not sufficient
+./build/dotnet-install.ps1 -Version 6.0.404
 
 # Install SDK and runtime as specified in global.json
 ./build/dotnet-install.ps1 -JsonFile "$PSScriptRoot/global.json"

src/MdDocs.MSBuild.IntegrationTest/MSBuildIntegrationTest.cs

@@ -31,7 +31,7 @@ private static IEnumerable<MSBuildRuntimeInfo> MSBuildRuntimes
         {
             get
             {
-                yield return new MSBuildRuntimeInfo(MSBuildRuntimeType.Core, Version.Parse("6.0.100"));
+                yield return new MSBuildRuntimeInfo(MSBuildRuntimeType.Core, Version.Parse("6.0.400"));
                 yield return new MSBuildRuntimeInfo(MSBuildRuntimeType.Core, Version.Parse("7.0.100"));
                 yield return new MSBuildRuntimeInfo(MSBuildRuntimeType.Full, Version.Parse("17.0"));
             }