Docker compose file for PostgreSQL

1. docker-compose.yml

version: '3.9'
services:
  postgres:
    image: 'postgres'
    env_file:
      - .env
    ports:
      - '5431:5432' # EXPOSED ON PORT 5431!!!
    volumes:
      - postgres-data:/var/lib/postgresql/data

volumes:
  postgres-data:

2. .env

POSTGRES_DB=database-name
POSTGRES_USER=admin
POSTGRES_PASSWORD=password