The DShell Pattern
summary
Adds a Makefile target called D shell that runs a service with `docker-compose run` and extra flags to publish ports and override the entrypoint so you land in a shell inside a container. Uses a multi-stage Dockerfile with a development stage that installs git, make and tooling, and a Compose v2 file that prefers env files and health checks over sleeps. Teaches `docker-compose down` to remove volumes and suggests a VS Code Remote Containers JSON that points to the interactive service.
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