See: https://github.com/dotnet/runtime/blob/master/src/libraries/System.Runtime.InteropServices.RuntimeInformation/src/System/Runtime/InteropServices/RuntimeInformation/RuntimeInformation.cs#L11

This code produces this output today (for 5.0):

.NET Core info
Version: 5.0.0
FrameworkDescription: .NET Core 5.0.0-preview.1.20120.5
CoreCLR Build: 5.0.0-preview.1.20120.5
CoreCLR Hash: 3c523a6
CoreFX Build: 5.0.0-preview.1.20120.5
CoreFX Hash: 3c523a6