This fixes the issue where `docker-compose` fails to build takahe:latest container. The cause of issue is the build context for docker compose is different from the one of `docker build`. Currently, `make image` uses the repository root as a build context while `make compose_up` will use `docker/` directory as a build context. That's why docker-compose couldn't find the required files during building.
TAKAHASHI Shuuji