Add Docker and Docker Compose for Local Dev

[codyhartsook]

Description:

Set up containerization for the Nanda Index to simplify local development and testing. Developers should be able to run the registry and MongoDB with a single docker-compose up --build command.

Tasks:

• Create a Dockerfile for the registry service.
• Add docker-compose.yaml to bring up:
  • Registry service
  • MongoDB
• Make ports, SSL certificates, and MongoDB URI configurable via environment variables.
• Use Docker volumes to persist MongoDB data.
• Add a README in deploy/docker with setup instructions.