How to create and setup a GCP project with Cloud Pub/Sub topics and subscriptions.

spring-cloud-gcp-pubsub-example-setup-gcp.sh

# login with your google credentials
# you will be asked to either use an existing project or create a new one
# for this article, I created the project hello-spring-cloud-gcp
$ gcloud init

# enable the Pub/Sub API
$ gcloud services enable pubsub.googleapis.com

# create a new Pub/Sub topic
$ gcloud pubsub topics create hello-pubsub

# create a subscription for the topic
$ gcloud pubsub subscriptions create --topic hello-pubsub hello-pubsub-subscription