Merge commit '36bca61764984ff5395653cf8377ec5daa71b709' as 'libs/protobuf'

libs/protobuf/kokoro/windows/csharp/build.bat

@@ -0,0 +1,17 @@
+@rem enter repo root
+cd /d %~dp0\..\..\..
+
+cd csharp
+
+@rem Install dotnet SDK
+powershell -File install_dotnet_sdk.ps1
+set PATH=%LOCALAPPDATA%\Microsoft\dotnet;%PATH%
+
+@rem Disable some unwanted dotnet options
+set DOTNET_SKIP_FIRST_TIME_EXPERIENCE=true
+set DOTNET_CLI_TELEMETRY_OPTOUT=true
+
+@rem Work around https://github.com/dotnet/core/issues/5881
+dotnet nuget locals all --clear
+
+call buildall.bat