How do I restore an ASP.NET Core Telerik package in a build pipeline before the project build command?

Question

I'm trying to build a CI/CD pipeline for a project that includes Telerik in an ASP.NET Core project and I followed a couple of tutorials but nothing seems to work. I already set up my NuGet feed in the project settings, and I used the .NET restore built in function in the build pipeline. What exactly do I have in my nuget.config file and what should I write before building the solution?

Thanks in advance.