Dockerizing flask app

I built a simple flask app that uses postgres for backend and plain html for frontend. The source can be found in https://codeberg.org/boink/cloud-scripts/src/branch/master/week-9/main.py

I used the postgres official docker image and constructed a docker-compose script to launch the app. The docker compose script is:

services:
  frontend:
    image: flask-fe
    environment:
      - POSTGRES_HOST=postgres
      - POSTGRES_PASSWORD=ubuntu
      - POSTGRES_PORT=5432
    depends_on:
      - postgres
    ports:
      - 5000:5000
  postgres:
    image: postgres
    restart: unless-stopped
    environment:
      - POSTGRES_PASSWORD=ubuntu