Add Docker Stack deployment template using ghcr.io image

[Copilot]

Adds docker-stack.yml for Docker Swarm deployments using the pre-built ghcr.io/gipplab/qlever-control:latest image.

Changes

• docker-stack.yml: Swarm deployment template with:

  • Resource limits (2 CPU/2GB) and reservations (0.5 CPU/512MB)
  • Restart policy, update/rollback configurations
  • Named volume for workspace persistence
  • Security warnings about Docker socket mount and horizontal scaling limitations

• README.md: Docker Stack usage section with deployment commands and container access patterns

Usage

docker swarm init
docker stack deploy -c docker-stack.yml qlever

# Access container
docker service ps qlever_qlever-control --filter desired-state=running
docker exec -it qlever_qlever-control.1.CONTAINER_ID bash

The template is production-ready but constrained to replicas: 1 due to Docker socket mount.

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