Created unit tests

[drache42]

This pull request includes significant changes to the Flask application structure, Docker setup, and testing framework. The most important changes involve the restructuring of the application into a modular format, updating the Docker configuration, and enhancing the testing suite.

Application Restructuring:

• src/wakeonlanservice/__init__.py: Introduced create_app function to create and configure the Flask application, including setting up logging and validating environment variables.
• src/wakeonlanservice/app.py: Updated to import and use the create_app function to create the Flask application instance.
• src/wakeonlanservice/blueprints/status.py: Refactored the original app.py to use Flask blueprints for better modularity and maintainability.

Docker Configuration:

• docker/Dockerfile: Updated the Dockerfile to reflect the new application structure, including changes to the COPY command and environment variables. [1] [2]

Testing Enhancements:

• tests/test_app.py: Added tests for the create_app and validate_env_variables functions to ensure proper application configuration and environment variable validation.
• tests/test_logging_config.py: Added tests for the logging configuration to verify correct logging levels based on the debug mode.
• tests/test_status.py: Added comprehensive tests for the status blueprint, including tests for different URL status scenarios and multiple application instances.

Documentation Update:

• README.md: Updated the instructions for creating the .vscode/launch.json file to reflect the new application structure and added the PYTHONPATH environment variable.

Dependency Management:

• pyproject.toml: Added new dependencies and configurations for testing and linting, including pytest-cov and ruff. [1] [2]
• src/requirements.txt: Removed redundant dependencies as they are now managed through pyproject.toml.