Docker compose with ssh-agent

docker-compose.yml

version: '2'

services:
  postgres:
    image: postgres:9.6
    ports:
      - "5432:5432"
    environment:
      POSTGRES_PASSWORD: a

  web:
    image: yanhao/ruby-dev:2.5.0
    hostname: web.dev
    ports:
      - "8000:8000"
    working_dir: /home/docker/src
    volumes:
      - ./src/web:/home/docker/src
      - ./tmp:/home/docker/.zsh_histories
      - "${HOME}/.vbuf:/home/docker/.vbuf"
    volumes_from:
      - ssh-agent
    environment:
      - HISTFILE=/home/docker/.zsh_histories/.zsh_history
      - PG_URL=postgres://postgres:a@postgres/veh
      - SSH_AUTH_SOCK=/.ssh-agent/proxy-socket
      - GIT_AUTHOR_NAME=Yanhao Yang
      - [email protected]
      - GIT_COMMITTER_NAME=Yanhao Yang
      - [email protected]

  ssh-agent:
    image: yanhao/ssh-agent # docker run --rm --volumes-from=x_ssh-agent_1 -v ~/.ssh:/.ssh -it yanhao/ssh-agent:latest ssh-add /root/.ssh/id_rsa