Please better instructions

[ivose]

If i use docker-compose.yml:

version: '3.1'

services:

  db:
    image: postgres
    restart: always
    environment:
      POSTGRES_PASSWORD: example

  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080

And go to http://localhost:8080. What is username and password? admin/example? psql/example? nothing works.
Thank you

[tianon]

Unfortunately, we do not have the bandwidth to provide in-depth integration/deployment/environment debugging or support here; these sorts of questions/requests would be more appropriately posted to a dedicated support forum, such as the Docker Community Slack, Server Fault, Unix & Linux, or Stack Overflow.