Integrate Content-Publisher Service Using Docker Compose

[enddynayn]

Description
To simplify the local development setup of our content publishing service, we need to introduce Docker Compose. This involves creating a docker-compose.yml file at the root of our project that defines and configures the content-publisher service using its Docker image.

Acceptance Criteria

• Add docker-compose.yml in the root of the directory
• The file should define a service name content-publishing-service
• Add environment variables necessary for content-publisher
• Update documentation in README.md
• Add network configurations to content-publisher
• Expose port