chore(ci): upload to nuget.org

Author: EuleMitKeule

.github/workflows/publish.yml

@@ -1,4 +1,4 @@
-name: Publish to GitHub Packages
+name: Publish
 
 on:
   push:
@@ -53,3 +53,6 @@ jobs:
 
       - name: Publish to GitHub Packages
         run: dotnet nuget push ./nupkg/*.nupkg --api-key ${{ secrets.GITHUB_TOKEN }} --source "github"
+
+      - name: Publish to NuGet.org
+        run: dotnet nuget push ./nupkg/*.nupkg --api-key ${{ secrets.NUGET_API_KEY }} --source "https://api.nuget.org/v3/index.json"