Enhance GitHub Actions workflow to include NuGet packaging and publishing

Author: iPazooki

.github/workflows/dotnet.yml

@@ -1,4 +1,4 @@
-# This workflow will build a .NET project
+# This workflow will build a .NET project and publish changes to NuGet
 # For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-net
 
 name: .NET
@@ -26,3 +26,9 @@ jobs:
       run: dotnet build --no-restore
     - name: Test
       run: dotnet test --no-build --verbosity normal
+    - name: Pack
+      run: dotnet pack --no-build -o ./nupkg
+    - name: Push to NuGet
+      env:
+        NUGET_API_KEY: ${{ secrets.NUGET_API_KEY }}
+      run: dotnet nuget push ./nupkg/*.nupkg -k $NUGET_API_KEY -s https://api.nuget.org/v3/index.json