A root certificate bundle valid for code signing and timestamping needs to be added to the .NET SDK so that related features have a valid root store on platforms that do not have a root store valid for general-purpose code signing and timestamping.

The relevant specifications are:

• Re-enabling signed NuGet package verification
• Re-enabling Cross-Platform NuGet Signed Package Verification Technical Specification

CC @richlander, @marcpopMSFT, @joeloff