Our builds are full of warnings:

.NET Core 2.1 is no longer supported and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the .NET support policy.

We are sure, that our libraries are should be compiled and run under netstandard2.0.

<NoWarn>NETSDK1138</NoWarn> disables this warning during the build, but how to disable it during setup-dotnet?