Creating a docker-compose.yaml file for php composer manager

Question

Сan someone explain what exactly command: install means in below compose.yaml file:

composer:
    image:composer/composer
    volumes:
      - ./document_root:/var/www/html
    command: install

Answer 1

Find Command doc here

as per doc it overrides the default command command: bundle exec thin -p 3000 and executes whatever command you give in that filed.