We have a build pipeline for a SharePoint Provider Hosted App using GitLab...we've just moved from DevOps ...however one of the packages is not available on NuGet so the build is failing...AppForSharePoint16WebToolkit.4.0.0.nupkg.
In DevOps I had access to the server so it was easy to add a copy of the package, but I don't have that with the corporate GitLab. How can I add a specific package to the project so it can be committed along with the code? Visual Studio 2019.