docker-compose.yml

version: "3"
services:
  php:
    build: .
    volumes:
      - ./html:/var/www/html
      - ./app:/app
    ports:
      - "8080:80"

  composer:
    image: composer
    volumes:
      - ./app:/app
    links:
      - php
    command: "composer update"

Dockerfile

FROM php:7.3-apache

RUN a2enmod rewrite