version: "3"
services:
  # service configuration for our database
  database:

    # use the preferred version of the official Postgres image
    # see https://hub.docker.com/_/postgres/
    image: postgres:9.6.21
    environment:
      - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
    # persist the database between containers by storing it in a volume
    volumes:
      - db_data:/var/lib/postgresql/data

  # service configuration for our dockerized Rails app
  app:

    # use the Dockerfile next to this file
    build: .
    entrypoint: /usr/local/bin/entrypoint.sh

    # rely on the RAILS_ENV value of the host machine
    # environment:
    #RAILS_ENV: $RAILS_ENV

    # makes the app container aware of the DB container
    depends_on:
      - database

    # expose the port we configured Unicorn to bind to
    ports:
      - "3000:3000"
    # map our application source code, in full, to the application root of our container
    volumes:
      - .:/var/www/consul
      - bundle:/usr/local/bundle
      - "$SSH_AUTH_SOCK:/tmp/agent.sock"
    environment:
      - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
      - SSH_AUTH_SOCK=/tmp/agent.sock
volumes:
  db_data: {}
  bundle: {}

version: "3"
services:
  # service configuration for our database
  database:

    # use the preferred version of the official Postgres image
    # see https://hub.docker.com/_/postgres/
    image: postgres:9.6.21
    environment:
      - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
    # persist the database between containers by storing it in a volume
    volumes:
      - db_data:/var/lib/postgresql/data

  # service configuration for our dockerized Rails app
  app:

    # use the Dockerfile next to this file
    build: .
    entrypoint: /usr/local/bin/entrypoint.sh

    # rely on the RAILS_ENV value of the host machine
    # environment:
    #RAILS_ENV: $RAILS_ENV

    # makes the app container aware of the DB container
    depends_on:
      - database

    # expose the port we configured Unicorn to bind to
    ports:
      - "3000:3000"
    # map our application source code, in full, to the application root of our container
    volumes:
      - .:/var/www/consul
      - bundle:/usr/local/bundle
    environment:
      - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
volumes:
  db_data: {}
  bundle: {}

Remove SSH_AUTH references in docker compose
Remove SSH_AUTH references in docker compose

It was added in commit 1db5a00ea, probably due to the Capistrano
configuration of the developer who wrote the code. On my machine, docker
compose crashed due to these lines.
