Figure I'll need this again

docker-compose.yml

version: "3.8"
services:
  db:
    image: "postgres:12"
    ports:
      - "54320:5432"
    volumes: 
      - ./pgdata:/var/lib/postgresql/data
    environment: 
      - POSTGRES_USER=usrnm
      - POSTGRES_PASSWORD=passwd
      - POSTGRES_DB=demo

# change vars

# rebuild with:
# docker-compose up --build --force-recreate -d

# enter container:
# docker-compose run db bash

# enter postgres interpreter:
# psql --username=usrnm --dbname=demo --host=db

# add .env file
# DATABASE_URL="postgresql://usrnm:passwd@localhost:54320/demo"