Implement Doppler as a centralized configuration provider

[the-khiem7]

This pull request introduces several improvements and new features across the build pipeline, configuration management, and development tooling. The most significant change is the integration of Doppler as a cloud-based configuration provider, which streamlines secret and configuration management. The Jenkins pipeline is refactored for better maintainability and more robust Docker image labeling and cleanup. Additionally, development environment settings are improved for better usability, and a new custom exception is added for configuration errors.

Configuration Management and Cloud Integration:

• Added Doppler as a configuration provider by introducing Doppler.Extensions.Configuration to the project dependencies and implementing AddConfigurationFromDopplerCloud in DependencyInjection.cs, allowing the app to load secrets from Doppler if a token is present. This includes propagating user-level environment variables and logging the configuration source. (SnakeAid.Api/DI/DependencyInjection.cs [1] [2]; SnakeAid.Api/Program.cs [3] [4]; SnakeAid.Api/SnakeAid.Api.csproj [5]; Directory.Packages.props [6]

• Introduced a new ConfigurationException class to standardize error handling for configuration-related failures. (SnakeAid.Core/Exceptions/ApiException.cs SnakeAid.Core/Exceptions/ApiException.csR115-R122)

CI/CD Pipeline Improvements:

• Refactored the Jenkins pipeline by extracting Docker build and push logic into reusable functions (withDockerImage, dockerBuildOnly, dockerBuildAndPush), enhancing maintainability and ensuring images are cleaned up after builds. Also, added more OCI-compliant Docker labels for traceability and context, and improved environment detection logic. (Jenkinsfile [1] [2] [3] [4] [5] [6]

• Removed the obsolete GitHub Actions workflow for deploying Docsify documentation, likely in favor of another documentation deployment strategy. (.github/workflows/deploy-docsify.yml .github/workflows/deploy-docsify.ymlL1-L44)

Development Environment and Tooling:

• Added a .vscode/settings.json to define default solution, file search, and watcher exclusions, improving the developer experience in VS Code. (.vscode/settings.json .vscode/settings.jsonR1-R41)

• Updated launch configurations in .vscode/launch.json to improve the accuracy of server URL detection regex patterns for debugging. (.vscode/launch.json [1] [2] [3] [4]

• Modified launchSettings.json to clear the default browser launch URLs, preventing automatic navigation to Swagger and giving developers more control. (SnakeAid.Api/Properties/launchSettings.json [1] [2]

Other Minor Changes:

• Minor whitespace and formatting adjustments for clarity and consistency. (SnakeAid.Core/Settings/AppSettings.cs SnakeAid.Core/Settings/AppSettings.csR47)

These changes collectively improve the project's configuration security, CI/CD robustness, and developer productivity.

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