[Postgres with Docker]: Data Persistence

docker-compose.yml

version: '3'

services:
    postgres:
        image: postgres:11.1-alpine
        container_name: shadowsDB
        environment:
            POSTGRES_DB: "league_of_shadows"
            POSTGRES_USER: "batman"
            POSTGRES_PASSWORD: "blueflower"
        volumes:
          - ./postgres:/docker-entrypoint-initdb.d
          - /tmp/postgres:/var/lib/postgresql/data # Dump Volume