Create the nupkg in the current directory

So that we avoid subdirectories in the artifacts. Maybe there's a more elegant solution like in TeamCity but I couldn't figure it out.

Author: 0xced

.github/workflows/continuous-integration.yml

@@ -26,12 +26,12 @@ jobs:
       - run: dotnet restore --verbosity normal
       - run: dotnet build --verbosity normal
       - run: dotnet test --no-build --verbosity normal
-      - run: dotnet pack --no-build --verbosity normal
+      - run: dotnet pack --output . --no-build --verbosity normal
         id: dotnet-pack
       - uses: actions/upload-artifact@v2
         with:
           name: nuget-package-${{ matrix.os }}
-          path: "**/*.nupkg"
+          path: ${{ steps.dotnet-pack.outputs.nupkg-filename }}
   publish-release:
     runs-on: macos-latest
     needs: package