(fix) update project config

[teetangh]

• Added .env file support for database configuration in README and .gitignore.
• Updated Spring Boot version from 3.4.3 to 3.5.5 in pom.xml.
• Introduced dotenv-java dependency for loading environment variables.
• Refactored CouchbaseConfig to use new property names for connection settings.
• Increased timeout settings for Couchbase connections in application.properties.
• Changed GitHub Actions Java distribution from "adopt" to "temurin".
• Updated test logging to provide clearer messages during cleanup operations.
• Fixed a typo in the expected airline type in AirlineIntegrationTest.

These changes enhance the application's configuration management and improve the clarity of test outputs.

[gemini-code-assist]

Summary of Changes

Hello @teetangh, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on modernizing the application's configuration management, improving its robustness, and refining the testing experience. It introduces a more flexible way to handle sensitive database credentials via .env files, updates core dependencies to leverage newer framework features, and adjusts database connection settings for better stability. These changes collectively aim to streamline development, enhance application reliability, and provide more informative test outputs.

Highlights

• Environment Variable Support: Introduced .env file support for database configuration, enhancing flexibility and security by keeping sensitive credentials out of version control. This includes a new configuration class and updates to the README.md and .gitignore.
• Dependency and Configuration Updates: Upgraded Spring Boot to version 3.5.5 and incorporated the dotenv-java library for robust environment variable loading. Couchbase configuration properties have been updated to align with the new Spring Boot 3.5+ naming conventions.
• Couchbase Connection Stability: Increased connection and operation timeouts for Couchbase to improve application stability, particularly in environments with higher latency or during initial connection attempts.
• Test Suite Improvements: Enhanced test logging to provide clearer messages during cleanup operations, reducing noise from expected exceptions. A specific typo in the expected airline type within AirlineIntegrationTest was also addressed.

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[gemini-code-assist]

Code Review

This pull request introduces several improvements, including updating the Spring Boot version, adding support for .env files for configuration, and refining Couchbase connection settings. These changes enhance the project's configuration management and keep dependencies current. My review has identified a critical issue in the new exception handling logic for Couchbase connections which could lead to application startup failures. Additionally, I've found a typo in an integration test that would cause it to fail. The remaining changes, such as documentation updates and logging improvements, are well-executed.