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Your team is utilizing Cloud Build to facilitate the promotion of a Node.js application deployed on App Engine from the staging environment to production. The application relies on several directories of photos stored in a Cloud Storage bucket named `webphotos-staging` in the staging environment. Post-promotion, these photos need to be accessible in a Cloud Storage bucket named `webphotos-prod` in the production environment. You aim to automate this process where feasible. What action should you take?