Upload nupkg artifact

Author: jcansdale

.github/workflows/dotnetcore.yml

@@ -8,6 +8,7 @@ on:
 
 env:
   config: Release
+  PackageOutputPath: nupkg
 
 jobs:
   build-test-publish:
@@ -37,7 +38,13 @@ jobs:
       run: dotnet test -c ${{ env.config }} --no-build /p:CollectCoverage=true /p:CoverletOutputFormat=opencover /p:Exclude="[Octokit.GraphQL]Octokit.GraphQL.*" .\Octokit.GraphQL.Core.Generation.UnitTests\Octokit.GraphQL.Core.Generation.UnitTests.csproj
 
     - name: Create package using .nuspec
-      run: dotnet pack pack.csproj --output .
+      run: dotnet pack pack.csproj --output ${{ env.PackageOutputPath }}
+      
+    - name: Upload nupkg artifact
+      uses: actions/upload-artifact@v2
+      with:
+        name: nupkg
+        path: ${{ env.PackageOutputPath }}/*.nupkg
 
     - name: Publish to GitHub Packages
       if: github.ref == 'refs/heads/master'