postgres with docker-compose, minimal example for [stackoverflow](https://stackoverflow.com/questions/63132779/hot-to-connect-dockerized-asp-net-core-app-dockerized-postgresql)

docker-compose.yml

version: '3.8'
services:
  db:
    image: postgres
    environment:
      - POSTGRES_PASSWORD=secret
    ports:
      - '5432:5432'
  admin:
    image: dpage/pgadmin4
    environment:
      - PGADMIN_DEFAULT_EMAIL=admin@example.com
      - PGADMIN_DEFAULT_PASSWORD=secret
    ports:
      - '80:80'

pg_admin.png

I run with docker-compose up -d, and then open http://localhost in the browser to access the postgres admin portal