While configuring a Cloud Pub/Sub trigger, you can now add a config variable for your service account

## Feature While configuring a [Cloud Pub/Sub trigger](https://cloud.google.com/application-integration/docs/configure-pubsub-trigger#configure-a-cloud-pubsub-trigger), you can now add a config variable for your service account. [Config variables](https://cloud.google.com/application-integration/docs/variables#config%5Fvar) let you externalize configuration for integrations.