installation: docker-compose env parameter not used, but shown for error msgs in logs

[Kasperx]

Hi

I got a joomla website on debian 11 running for some months and one day the mysql db crashed. So I'm trying to install the system again. "Can't be that difficult" :/
I used the same docker-compose-file for new env with some different passwords und started. Of course it didn't work, the parameters in environment section weren't read out and so I had to input all to website manually and accidently put some errors there. So installation didn't work.
After many trials I copied the example docker-compose content from docs to another local file and updated parameters from my system like name and pws. After docker-compose -f <file-name> up --force-recreate -d I asked logs and got some surprising errors.

Remember:

Sooo ... I input the required parameter JOOMLA_DB_HOST to env and started again. Next error.

Seems like error in doc I guess :(

Sooo ... I input the required parameter JOOMLA_DB_PASSWORD (and ...USER and ...NAME :P) to env and started again. Working :)
So all required parameters in compose file so that I don't need to input anything manually for installation, right?
Ups

Next dialog surprise ...

Why? Whats the advantage of using parameters then?
My docker-compose.yml looks like following:

version: "3.4"
services:

  joomla:
    image: joomla:5.4.3
    container_name: container1
    restart: unless-stopped
    ports:
      - 12345:80
      - 23456:443
    environment:
      JOOMLA_DB_HOST: db
      JOOMLA_DB_PASSWORD: example1
      JOOMLA_DB_USER: joomla
      JOOMLA_DB_NAME: joomla_db
      JOOMLA_SITE_NAME: something
      JOOMLA_ADMIN_USER: Joomla_admin
      JOOMLA_ADMIN_USERNAME: Joomla_admin
      JOOMLA_ADMIN_PASSWORD: example2
      JOOMLA_ADMIN_EMAIL: myemail
#      MYSQL_PORT_3306_TCP:
    volumes:
      - some-nice-folder:/var/www/html
    networks:
      - network2
    links:
#      - "db:joomla_db"
#      - "db:mysql"
      - db

  db:
    image: mysql:8.4.8
    container_name: container2
    restart: unless-stopped
    environment:
      MYSQL_DATABASE: joomla_db
      MYSQL_USER: joomla
      MYSQL_PASSWORD: example1
#      MYSQL_RANDOM_ROOT_PASSWORD: '1'
      MYSQL_ROOT_PASSWORD: example3
    volumes:
      - some-nice-folder:/var/lib/mysql
    networks:
      - network2

networks:
  network2:

What do I miss?
Thanks