Enhance Docker Setup for Running Automation Scripts

[RickyDicaprio]

Improve the Docker configuration so contributors can run any automation script inside a consistent and isolated environment.

Tasks

1. Update docker/Dockerfile with Python dependencies
2. Improve docker-compose.yml to support mounting the scripts/ folder
3. Add an entry to docker/entrypoint.sh for running Python scripts automatically
4. Add instructions to docs/docker_guide.md
5. Test that backup_folder.py and cleanup_temp.py run correctly inside Docker

Goal
Make the Docker environment easy to use so contributors don’t need to install Python or packages locally.