You want to build a CI/CD pipeline in GCP that builds Docker images, deploys them to GKE, and also uses Secrets for sensitive information. Which services should you use to fulfill all these requirements in a GCP idiomatic way?

*Explanation:* To build a GCP idiomatic CI/CD pipeline that builds Docker images, deploys them to GKE, and uses Secrets for sensitive information, you should use Cloud Build and Secret Manager. Cloud Build is a native GCP service for CI/CD that integrates seamlessly with GKE, allowing you to build and deploy Docker images. Secret Manager is designed to manage secrets securely in GCP, ensuring sensitive information is handled appropriately. Other options like Jenkins on Compute Engine, GitLab, CircleCI, Travis CI, or using Cloud KMS with non-GCP services may work but may introduce more complexity or require additional setup that is not as idiomatic to GCP.