Add NuGet publish step to workflow

Author: afriscic

.github/workflows/publish-nuget.yml

@@ -28,3 +28,6 @@ jobs:
 
       - name: Pack
         run: dotnet pack BarcodeScanning.Native.Maui/BarcodeScanning.Native.Maui.csproj -c Release -o ./nupkgs
+
+      - name: Publish to NuGet
+        run: dotnet nuget push ./nupkgs/*.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source https://api.nuget.org/v3/index.json