v0.2.2

This release address the following:

• fixes build failures due to buildkit
• upgrades CartService to .NET 5
• Cartservice - managed gRPC
• (respectful-code) replaces instances of the word "whitelist" with "Allow"
• workaround for a NuGet bug causing CartService builds to fail
• fixed an improperly-caught exception but in recommendationservice
• gRPC health probe upgrade
• base image upgrades for Node, Python, .NET