- Add Dockerfile.user.example and docker-compose.override.example.yml (root dev variant)
- Add deploy/Dockerfile.user.example and deploy/docker-compose.override.example.yml (deploy variant)
- Update .gitignore to exclude Dockerfile.user and docker-compose.override.yml
- Update .dockerignore to exclude Dockerfile.user
Enables users to extend the container with custom tools using Docker
Compose's native override mechanism without modifying maintainer-owned
files or risking accidental commits of personal customizations.