Building and pushing an application

We have seen earlier that we can also use the docker-compose build command to just build the images of an application defined in the underlying docker-compose file. But to make this work, we'll have to add the build information to the docker-compose file. In the folder, we have a file, docker-compose.dev.yml, which has those instructions already added. It is basically a copy of the docker-compose.yml file we have used so far:

version: "2.4"
services:
  web:
    build: web
    image: fundamentalsofdocker/ch11-web:2.0
    ports:
      - 80:3000
  db:
    build: db
    image: fundamentalsofdocker/ch1-db:2.0
    volumes:
      - pets-data:/var/lib/postgresql/data

volumes:
  pets-data:

Please note the build key for each service. The value of that key indicates the context or...