3 packages returned for Tags:"snk"

This is an msbuild target that will try to create the key file that is used by the project it is installed to when it doesn't exist already. Which is a well known problem for open source projects: You do want to sign your assemblies, but you don't want to give away the key file.
Signs unsigned assemblies at build-time. This is useful if your project requires signing and you use third-party unsigned libraries.