Why does the script not find files in the docker container?

Question

Docker

I'm trying to move from version 2 to version 3 of docker compose
, I corrected the file, everything is going, but when I run the script, it swears that the files were not found, the
autoloader does not work. I made something with the paths, I don’t understand what.
I'm just starting to understand docker, so don't judge too harshly

#docker-compose.yaml

version: '3.7'
services:
    php:
        container_name: ultra_php
        build: docker/php
        restart: always
        volumes:
            - ./:/var/www/ultra
        command: sh ./docker/php/auto-start.sh
        depends_on:
            - db

    nginx:
        container_name: ultra_nginx
        build: docker/nginx
        restart: always
        depends_on:
            - php
        volumes:
            - type: bind
              source: ./
              target: /var/www/ultra

    db:
        image: mysql:5.6
        container_name: ultra_db
        restart: always
        environment:
            MYSQL_ROOT_PASSWORD: root
            MYSQL_DATABASE: ultra

#nginx/dockerfile

FROM nginx

COPY nginx.conf /etc/nginx/

RUN usermod -u 1000 www-data