Add publish task

Author: IntelOrca

.github/workflows/ci.yml

@@ -25,3 +25,6 @@ jobs:
         fail_on_unmatched_files: true
         files: |
           out/*.nupkg
+    - name: Publish to nuget.org
+      if: startsWith(github.ref, 'refs/tags/v')
+      run: dotnet nuget push out/*.nupkg --api-key "${{ secrets.NUGET_APIKEY }}" --source https://api.nuget.org/v3/index.json