Implement staging environment in Spring Boot

[leonard1thecoder]

Feature: Implement Staging Environment in Spring Boot

Summary

Add a staging environment setup to the Spring Boot application in leonard1thecoder/AA for testing deployments before production. This new environment will allow developers to validate features and configurations safely.

Requirements

• Create a separate staging profile (application-staging.yml) for configuration.
• Configure environment variables and secrets for staging (database, external services, etc).
• Set up deployment scripts for staging (Docker/CI/CD).
• Document how to run, deploy, and test in the staging environment in the README.

Benefits

• Safer testing before production releases.
• Ability to mimic production closely for validation.

Implementation Steps

1. Add application-staging.yml config file.
2. Adjust CI/CD pipeline for staging deploys.
3. Enable environment selection via command-line or CI/CD variables.
4. Add documentation for staging setup and usage.

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Label: enhancement