Getting error mysqli::real_connect(): (HY000/2002): No such file or directory when trying to use phpma after running docker-compose script

Question

I am getting the following error after running my docker-compose script: mysqli::real_connect(): (HY000/2002): No such file or directory. I've looked at Getting error mysqli::real_connect(): (HY000/2002): No such file or directory when I try to access my project on live server for answers but the given solutions don't work for me.

My docker-compose script looks like this:

version: '3'

services:
  # Database
  db:
    image: mysql:latest
    volumes:
      - database:/var/lib/mysql
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: Password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: Password
    networks:
      - wpsite
  # phpMyAdmin
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin:latest
    restart: always
    ports:
      - '8080:80'
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: Password
    networks:
      - wpsite
    volumes: ['./config:/etc/phpmyadmin/']
  # Wordpress
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - '80:80'
    restart: always
    volumes: ['./wordpress:/var/www/html']
    environment:
      WORDPRESS_DB_HOST: db:3306
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: Password
    networks:
      - wpsite
networks:
  wpsite:
volumes:
  database:

So far I've tried changing $cfg['Servers'][$i]['host'] = 'localhost'; in the /etc/phpmyadmin/config.inc.php to both $cfg['Servers'][$i]['host'] = '127.0.0.1'; and $cfg['Servers'][$i]['host'] = 'db';. Neither of these options fix the problem. I made sure they get changed properly after rerunning the script.