Add Docker development environment

[AvinashShelukar]

Summary

Adds a Dockerfile and supporting files to provide an official Docker-based development environment for Synthea.

Details

• Uses openjdk:21-jdk-slim as the base image.
• Installs Git, Gradle, and minimal utilities.
• Copies source, builds using Gradle, and sets ./run_synthea as default command.
• Includes .dockerignore to reduce image size.
• Adds optional docker-compose.yml for interactive development.
• Updates README.md with usage instructions.

How to Test

1. Build the image:

   docker build -t synthea-dev .
   
   
   
   
   
   

[shabiel]

Just FYI: I looked at the code being a docker usage expert, and I don't like it. There are multiple issues with the Dockerfile (a simple one is the use of CMD instead of ENTRYPOINT).

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