Laravel Docker "Unable to create a directory at /var/www/storage/app/documents" - laravel

Question

I use Laravel 9 with Docker if I want to upload images like this:
$document["file_object"]->store('documents')
I get the following error: Unable to create a directory at /var/www/storage/app/documents
It looks like it ist some kind of Docker permission error.
I use the local Filesystems Disk because none of my files should be public.
If I change the 'root' => storage_path('app') to 'root' => storage_path('') inside the filesystems config I don't get any error but the files are saved in here: /storage/documents but they should be in /storage/app/documents.
I think I need to modify some docker user permission, but im unsure how as I'm not the one who made the config an my docker skills are limited.
Dockerfile:
FROM php:8.1-apache
WORKDIR /var/www
RUN apt-get update && apt-get install -y \
libfreetype6-dev \
libjpeg-dev \
libpng-dev \
libwebp-dev \
--no-install-recommends \
&& docker-php-ext-enable opcache \
&& docker-php-ext-configure gd --with-freetype --with-jpeg \
&& docker-php-ext-install pdo_mysql -j$(nproc) gd \
&& apt-get autoclean -y \
&& rm -rf /var/lib/apt/lists/*
RUN pecl install redis && docker-php-ext-enable redis
# Update apache conf to point to application public directory
ENV APACHE_DOCUMENT_ROOT=/var/www/public
RUN sed -ri -e 's!/var/www/html!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/sites-available/*.conf
RUN sed -ri -e 's!/var/www/!${APACHE_DOCUMENT_ROOT}!g' /etc/apache2/apache2.conf /etc/apache2/conf-available/*.conf
# Update uploads config
RUN echo "file_uploads = On\n" \
"memory_limit = 1024M\n" \
"upload_max_filesize = 512M\n" \
"post_max_size = 512M\n" \
"max_execution_time = 1200\n" \
> /usr/local/etc/php/conf.d/uploads.ini
# Enable headers module
RUN a2enmod rewrite headers
ADD . /var/www
RUN chown -R www-data:www-data /var/www
docker-compose.yml:
# https://waihein.medium.com/configuring-redis-on-docker-in-laravel-58a39556ff97
# https://medium.com/#chewysalmon/laravel-docker-development-setup-an-updated-guide-72842dfe8bdf
# https://shouts.dev/articles/dockerize-a-laravel-app-with-apache-mariadb
# FIRST Start:
# 1. Run ON WINDOWS: docker run --rm -v ${pwd}:/app composer install
# or on UNIX: docker run --rm -v “$(pwd)”:/app composer install
# 2. Run: npm run setup
# npm run setup is doing: "docker-compose up -d --build && docker-compose exec app php artisan key:generate && docker-compose exec app php artisan migrate:fresh --seed && npm install && npm run dev"
# NORMAL Start: npm start
# npm start is doing: "docker-compose up -d && npm install && npm run dev"
# To stop: docker-compose down
version: '3.8'
services:
# Application & web server
app:
build:
context: .
working_dir: /var/www
container_name: immo-app
volumes:
- ./:/var/www
depends_on:
- "database"
ports:
- 80:80
networks:
- immonet
# Database
database:
image: 'mariadb:latest'
container_name: immo-database
restart: unless-stopped
expose:
- 3306
environment:
MYSQL_DATABASE: ${DB_DATABASE}
MYSQL_ROOT_PASSWORD: ${DB_PASSWORD}
MYSQL_PASSWORD: ${DB_PASSWORD}
MYSQL_USER: ${DB_USERNAME}
volumes:
- dbdata:/var/lib/mysql
networks:
- immonet
# Database management
pma:
image: phpmyadmin:5.1
container_name: immo-phpmyadmin
environment:
- PMA_ARBITRARY=1
- PMA_HOST=${DB_HOST}
- PMA_USER=${DB_USERNAME}
- PMA_PASSWORD=${DB_PASSWORD}
- PMA_PORT=${DB_PORT}
depends_on:
- database
ports:
- 8888:80
networks:
- immonet
# Redis
redis:
image: redis:alpine
container_name: immo-redis
volumes:
- ./data/redis:/data
expose:
- 6379
networks:
- immonet
volumes:
dbdata:
networks:
immonet:
driver: bridge

Answer 1

You should not be using www-data as the owner and group of your /var/www folder. It should be your nomal user (possibly WSL user?). If the docker container does not work without www-data, then you need to refactor it a bit, but the issue is arround the permissions.
Just try having your normal user as the owner and group of /var/www