Re-block extensions from building on workflow push

Author: jellejurre

.github/workflows/ci.yaml

@@ -97,6 +97,7 @@ jobs:
           INCLUDE_SYMBOLS: true
 
       - name: Publish to VRChat.API.Extensions.Hosting to NuGet
+        if: github.event_name == 'repository_dispatch'
         uses: pairbit/publish-nuget@v2.5.8
         with:
           # Filepath of the project to be packaged, relative to root of repository