Improve the local development process based on docker-compose
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## Summary by CodeRabbit
- **New Features**
- Introduced a centralized configuration utility that validates
environment variable types and provides fallback defaults.
- **Refactor**
- Standardized environment variable handling across configuration files,
improving maintainability and consistency in system setup.
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closes https://github.com/cnpm/cnpmcore/issues/731
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## Summary by CodeRabbit
## Release Notes
- **New Features**
- Added support for PostgreSQL alongside MySQL, including a new database
setup script and comprehensive documentation for local development.
- Introduced a new CI job for PostgreSQL testing in the GitHub Actions
workflow.
- Enhanced the `README.md` and `DEVELOPER.md` files to provide clearer
instructions for using both database systems.
- Added new environment variable configurations for PostgreSQL in the
Docker deployment documentation.
- **Bug Fixes**
- Improved error handling in tests for duplicate entries to accommodate
both MySQL and PostgreSQL error messages.
- **Documentation**
- Updated setup instructions for PostgreSQL and clarified MySQL setup in
the documentation.
- Enhanced contributor information in the README.
- Expanded instructions for setting up Elasticsearch and Kibana,
including environment variable configurations.
- **Chores**
- Updated package dependencies to include PostgreSQL client libraries
and modified scripts to support both databases.
- Changed the base image in the Dockerfile to a newer Node.js version.
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