Add container name and environment variable specification to docker-compose.yaml

[YoshikiKubotani]

Why

The current docker-compose.yaml file does not have the name field, leading to the name confliction when multiple containers are booted up. Also, it would be more convenient to have env_file field by default, as it allows to set environment variables by using a .env file.

Definition of Done

• name filed is added to both cpu/gpu docker-compose.yaml files
• env_file field is added to both cpu/gpu docker-compose.yaml files
• A sample environment file envs.env.sample is created under <PROJECT_ROOT>/environment
• An original environment file envs.env is added to .gitignore

How

Edit docker-compose.yaml files

Note

docker/compose#745 (comment)