Add Docker Compose for local MongoDB development

[GouravRusiya30]

Motivation

• Provide an easy, reproducible local MongoDB for contributors to run the API without manual MongoDB installation.
• Make the default local MONGODB_URI work out-of-the-box with a documented Docker Compose setup.

Description

• Add docker-compose.yml that runs mongo:7, maps 27017:27017, persists data to a named mongodb_data volume, and includes a mongosh ping healthcheck.
• Update README.md to recommend Docker/Docker Compose for local development and show docker compose up -d mongodb to start MongoDB.
• Add instructions to the README.md for running the application locally with ./gradlew bootRun and for stopping/removing the Compose resources with docker compose down and docker compose down -v, and note the default MONGODB_URI=mongodb://localhost:27017/rest_tutorial works with the Compose service.

Testing

• Attempted to run the project test suite with ./gradlew test, but it was blocked because the environment could not download the Gradle distribution from services.gradle.org (network unreachable).
• Attempted to validate the Compose file with docker compose config, but it was blocked because the Docker CLI is not installed in the execution environment.

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[chatgpt-codex-connector]

Bind MongoDB to localhost only

For local development on a host where Docker-published ports are reachable from other machines, this exposes the unauthenticated MongoDB instance beyond the developer's machine. The README describes the service as being on localhost:27017, but Docker's port-publishing docs say mappings without a host address publish to all host addresses (0.0.0.0 and [::]); use 127.0.0.1:27017:27017 to keep this dev database local.

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