React Native Deployment & CI/CD Setup

I have a React Native app paired with a FastAPI + MongoDB backend that is feature-complete but still living only on my local machines. My goal is to automate everything: build, test, and deploy the mobile app to Google Play and ship the backend to production with a clean, reproducible pipeline.

What I need
• A fresh CI/CD pipeline created from scratch—no legacy scripts to refactor.
• Stages must cover Build, Test, and Deploy for both codebases.
• The Android package must reach the Play Store under my developer account, with signing handled securely.
• The FastAPI service (talking to MongoDB) should deploy automatically to the environment we agree on (Docker/K8s, AWS, GCP, etc.).

Deliverables
1. Working CI/CD configuration files (GitHub Actions, Bitrise, GitLab CI, or similar) committed to the repo.
2. Automated unit/integration tests triggered on every push.
3. Successful Play Store release in production track.
4. Backend deployed through the same pipeline with rollback capability.
5. A short README walking me through environment variables, secrets management, and how to trigger future releases.

If you’ve shipped React Native apps and FastAPI services before and can demo an existing pipeline you built, let’s get this automated and live.