Downloading credentials. Spinnaker needs a service account to authenticate as against GCE, with the role enumerated below enabled. If you don’t already have such a service account with the corresponding JSON key downloaded, you can run the following commands to do so: Please ask admin to find out the Google Service Account used to create the cluster and then add your account as its Service Account User via Service accounts. From the list table, check the service account, click the Info Panel, you will find a button Add member and add it as Service Account User. Summary. In this codelab you will learn how to deploy a Python Flask web application to the App Engine Flexible environment. The example application allows a user to upload a photo of a person's face and learn how likely it is that the person is happy.