Why is composer not working?

Docker Engine Compose
1

Hello,
The docker compose is:

portal:
    build:
      context: /home/devops/Projects/portal
      dockerfile: Dockerfile
    container_name: portal
    entrypoint: ["/usr/local/bin/entrypoint.sh"]
    command: ["php-fpm"]
    network_mode: host
    environment:
      APP_ENV: local
      APP_DEBUG: "true"
      DB_HOST: host.docker.internal
      DB_PORT: 3306
      DB_DATABASE: laravel
      DB_USERNAME: root
      DB_PASSWORD: 123456
#      XDEBUG_CONFIG: "client_host=host.docker.internal client_port=9003"
      PORTAL_VIEW_URL: http://127.0.0.1:3000
    volumes:
      - /home/devops/Projects/portal:/var/www
#      - /var/www/vendor
    ports:
      - "127.0.0.1:9000:9000"

And Dockerfile is:

FROM php:8.3-fpm
RUN apt update && apt install -y \
    build-essential \
    libpng-dev \
    libjpeg62-turbo-dev \
    libfreetype6-dev \
    libonig-dev \
    libzip-dev \
    zip unzip git curl net-tools ncat iputils-ping \
    && apt clean && rm -rf /var/lib/apt/lists/*
RUN docker-php-ext-configure gd --with-freetype --with-jpeg \
    && docker-php-ext-install pdo_mysql mbstring zip exif pcntl gd
RUN pecl install xdebug && docker-php-ext-enable xdebug
RUN curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local
/bin --filename=composer
RUN groupadd -g 1000 www && useradd -u 1000 -ms /bin/bash -g www www
COPY --chown=www:www . /var/www/
WORKDIR /var/www
COPY --chown=www:www entrypoint.sh /usr/local/bin/
RUN chmod +x /usr/local/bin/entrypoint.sh
ENV APP_ENV=local
ENV APP_DEBUG=true
ENV XDEBUG_MODE=develop,debug
USER www
EXPOSE 9000
CMD ["php-fpm"]

The entrypoint.sh is:

#!/bin/bash
if [ "$(ls -A /var/www)" ]; then
    echo "Directory is not empty, skipping copy"
else
    echo "Directory is empty, copying files"
    cp -R /tmp/app/. /var/www/
fi
if [ -f "/var/www/composer.json" ]; then
    cd /var/www
    composer install --no-interaction --optimize-autoloader --no-scripts
fi
if [ -z "$(grep 'APP_KEY=base64' /var/www/.env)" ]; then
    echo "Generating APP_KEY..."
    cd /var/www
    php artisan key:generate
fi
chown -R www:www /var/www/storage
chown -R www:www /var/www/bootstrap/cache
chown -R www:www /var/www/vendor
chmod -R 775 /var/www/storage
chmod -R 775 /var/www/bootstrap/cache
chmod -R 775 /var/www/vendor

But inside the container I get the following error:

$ php artisan tinker

Warning: require(/var/www/vendor/autoload.php): Failed to open stream: No such f
ile or directory in /var/www/artisan on line 9
Call Stack:
    0.0002     462856   1. {main}() /var/www/artisan:0
Fatal error: Uncaught Error: Failed opening required '/var/www/vendor/autoload.p
hp' (include_path='.:/usr/local/lib/php') in /var/www/artisan on line 9
Error: Failed opening required '/var/www/vendor/autoload.php' (include_path='.:/
usr/local/lib/php') in /var/www/artisan on line 9
Call Stack:
    0.0002     462856   1. {main}() /var/www/artisan:0

Which part is wrong?

Thank you.