Per this Custom Runtimes docs <https://cloud.google.com/appengine/docs/flexible/custom-runtimes/testing-and-deploying-your-app> running on App Engine Flexible Environment:
You run your application locally with the native development tools that you > usually use. For example, you can download and install Docker > <https://docs.docker.com/engine/installation/> to run and test your > containerized apps on your local machine. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/2b09745f-9ff4-4258-84f0-f7ccc6762e03%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
