My docker-compose can’t find the current user and, instead of using him as the owner of created volumes, it sets a random other user on the system as the owner.
Here’s my docker-compose.yaml:

version: "3"

services:
  # Database
  db:
    image: mysql:5.7
    volumes:
      - ./db_data:/var/lib/mysql
      - ./mysql-custom.cnf:/etc/mysql/conf.d/mysql-custom.cnf
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: password
      MYSQL_DATABASE: wordpress
      MYSQL_USER: wordpress
      MYSQL_PASSWORD: wordpress
    networks:
      - wpsite
  # phpmyadmin
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    restart: always
    ports:
      - "8080:80"
    environment:
      PMA_HOST: db
      PMA_PORT: "3310"
      PMA_PORTS: "3310"
      MYSQL_ROOT_PASSWORD: password
    networks:
      - wpsite
  # WordPress
  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - "8000:80"
    restart: always
    volumes:
      - "./wp:/var/www/html"
      - "./custom-php.ini:/usr/local/etc/php/conf.d/custom-php.ini"
    environment:
      WORDPRESS_DB_HOST: db:3310
      WORDPRESS_DB_USER: wordpress
      WORDPRESS_DB_PASSWORD: wordpress
    networks:
      - wpsite
networks:
  wpsite:

When creating the volume, random users are taken as the owners of the local attached folders:
Bash:

-rw-rw-r-- 1 caesar   caesar     46 May  5 08:33 custom-php.ini
drwxr-xr-x 2 ollama   root     4096 May  5 08:41 db_data
-rw-rw-r-- 1 caesar   caesar   1066 May  5 08:41 docker-compose.yaml
-rw-rw-r-- 1 caesar   caesar     21 May  5 08:33 mysql-custom.cnf
drwxr-xr-x 5 www-data www-data 4096 May  5 08:41 wp

I already tried specifying a $UID and a hardcoded user in the docker-compose.yaml, but to no avail… my current user is not found.

Finally, I do exist:

caesar@debian:/media/data/repos/test/wp-gigi$ getent passwd | grep caesar
caesar:x:1000:1000:Caesar,,,:/home/caesar:/bin/bash