Feat/lab1 containerisation

[JessFreak]

• Implemented containerization using multi-stage Docker builds and Docker Compose to streamline the application workflow and environment consistency.
• Developed a comprehensive validation suite in tests/lab1_test.sh to ensure health checks, JSON logging, and system resilience.
• Configured a CI/CD pipeline via GitHub Actions (lab1.yml) to automate testing, build processes, and secret management.