docker-compose.yml

version: '3.0'
services:
  db:
    container_name: db
    image: postgres:12
    ports:
      - "5432:5432"
    env_file:
      - .env
    networks:
      - postgres_network

  pgadmin:
    container_name: pgadmin
    image: dpage/pgadmin4
    env_file:
      - .env
    ports:
      - "16543:80"
    networks:
      - postgres_network
    depends_on:
      - db

  api:
    # name of container
    container_name: api
    # path where dockerfile is
    build: ./api/
    # start running
    command: python app.py 
    # set app ports
    ports:
      - "5000:5000"
    # sync local files to container | same_path_on_build:workdir_on_dockerfile
    volumes:
      - ./api/:/usr/src/project/api # change {project} for your project's name
    # set environment variables
    env_file:
      - .env
    # connect to another container
    networks:
      - postgres_network

networks: 
  postgres_network:
    driver: bridge