Add a name to the NuGet package artifact

Logs are really weird without a name:

> Finished uploading artifact artifact. Reported size is 38159 bytes. There were 0 items that failed to upload
> Artifact artifact has been successfully uploaded!

Author: 0xced

.github/workflows/continuous-integration.yml

@@ -30,6 +30,7 @@ jobs:
         id: dotnet-pack
       - uses: actions/upload-artifact@v2
         with:
+          name: nuget-package-${{ matrix.os }}
           path: "**/*.nupkg"
   publish-release:
     runs-on: macos-latest