Feature/GitHub workflows

[MoamenEltouny]

This pull request introduces automated PHP coding standards enforcement and improves the test workflow configuration. The main changes include adding a GitHub Actions workflow for PHP CS Fixer, providing a project-specific configuration for code style, and refining the test workflow for clearer output and more targeted branch execution.

Automated code style enforcement:

• Added .github/workflows/php-cs-fixer.yml to automatically run PHP CS Fixer on every push, ensuring code adheres to defined standards and committing fixes automatically.
• Added .php-cs-fixer.dist.php configuration file specifying rules (e.g., PSR-12, short array syntax, import ordering) and directories/files to include or exclude from fixing.

Test workflow improvements:

• Updated .github/workflows/tests.yml to only trigger on pushes to main and develop branches and on pull requests, reducing unnecessary runs.
• Changed PHPUnit command to use --testdox for more readable test output.

Code style consistency:

• Fixed import order in tests/database/migrations/create_articles_table.php to comply with coding standards.