Clone the k8sdevopscookbook/src repository to your workstation to use the manifest files under the chapter3 directory:

$ git clone https://github.com/k8sdevopscookbook/src.git
$ cd /src/chapter3

Make sure you have the necessary credentials to use GCP services and have access to the current project. If you don't have one already, go to https://console.cloud.google.com and create an account.