Django local dev on docker-compose

docker-compose.yml

version: "3.8"

services:
  web:
    build: .
    command: python manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/app
    ports:
      - "8000:8000"
    depends_on:
      - db

  db:
    image: postgres
    environment:
      - POSTGRES_DB=db_name
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres

Dockerfile

FROM python:3
ENV PYTHONUNBUFFERED 1
RUN mkdir /app
WORKDIR /app
COPY requirements.txt /app/
RUN pip install -r requirements.txt

Mostly taken from https://www.untangled.dev/2020/06/06/docker-django-local-dev/