Workaround for bug in empty build args

test/Dockerfile.test.nanoserver

@@ -12,4 +12,4 @@ RUN dotnet new web --framework %FRAMEWORK%
 RUN if not exist "%USERPROFILE%/.nuget/" mkdir "%USERPROFILE%/.nuget/"
 RUN if not exist "%USERPROFILE%/.nuget/packages" mkdir "%USERPROFILE%/.nuget/packages"
 RUN dotnet restore --source "%USERPROFILE%/.nuget/packages" -p:RuntimeIdentifiers=win7-x64
-RUN dotnet build "%BUILD_ARGS%"
+RUN dotnet build %BUILD_ARGS%

test/test.ps1

@@ -87,7 +87,7 @@ function test_image ($version, $sdk_tag, $runtime_tag) {
  Replace("{image}", $sdk_tag) `
  | docker build `
  --build-arg FRAMEWORK=$framework `
- --build-arg BUILD_ARGS=$no_restore_flag `
+ --build-arg BUILD_ARGS="--configuration Release $no_restore_flag" `
  -t $app_build_tag `
  -