Docker setup for Drupal with bootstrap theme

docker-compose.yml

version: "2"

services:
  drupal:
    build:
      context: .
      dockerfile: drupal.Dockerfile
    image: custom-drupal
    ports:
      - 8080:80
    volumes:
      - drupal-modules:/var/www/html/modules
      - drupal-profiles:/var/www/html/profiles
      - drupal-themes:/var/www/html/themes
      - drupal-sites:/var/www/html/sites
  postgres:
    image: postgres:12.1
    environment:
      POSTGRES_DB: drupal
      POSTGRES_USER: user
      POSTGRES_PASSWORD: password
    volumes:
      - drupal-data:/var/lib/postgresql/data

volumes:
  drupal-modules:
  drupal-profiles:
  drupal-themes:
  drupal-sites:
  drupal-data:

drupal.Dockerfile

FROM drupal:8.8.2

RUN apt-get update \
  && apt-get install -y git \
  && rm -rf /var/lib/apt/lists/*

WORKDIR /var/www/html/themes

RUN git clone --branch 8.x-3.x --single-branch --depth 1 https://git.drupal.org/project/bootstrap.git \
  && chown -R www-data:www-data bootstrap

WORKDIR /var/www/html