[Vuejs]-AppEngine + GitHub integration

If you mean uploading your project to Google App Engine manually, documentation for how to do so is available here: https://cloud.google.com/appengine/docs/standard/nodejs/testing-and-deploying-your-app

From my understanding you have created a App Engine build trigger on commit. In order to manually use your trigger, please open the triggers page on the dashboard. Find your trigger and click “Run Trigger”[1].

[1] https://cloud.google.com/cloud-build/docs/automating-builds/create-manage-triggers#testing_a_build_trigger