How to run docker with a big project?

Question

Docker

Good morning!
Situation
1) have docker-compose

php-fpm:
    image: php:7.2-fpm
    env_file: .env
    volumes:
      <b>- ./:/var/www</b>

2) In the project directory (./frontend/web/img/products/) there are about 12 GB of images
Problem
On startup

docker-compose up -d --build

Gives an error message:

Building nginx
ERROR: Error processing tar file(exit status 1): write /frontend/web/img/products/81/some_image.jpg: no space left on device

Investigation
I check that there is space on the disk... Well, all right, I deleted all containers and images, rebooted the server, I started it - the same thing.
I run it again and look at the disk:
1)

:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 982M 0 982M 0% /dev
tmpfs 200M 7.7M 193M 4% /run
/dev/vda2 40G 21G 17G 56% /
...

2)

:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 982M 0 982M 0% /dev
tmpfs 200M 7.7M 193M 4% /run
/dev/vda2 40G 23G 15G 56% /
...

...
n)

:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 982M 0 982M 0% /dev
tmpfs 200M 7.7M 193M 4% /run
/dev/vda2 40G 38G 1G 56% / ...

In general, it can be seen that during the launch process, the place disappears somewhere.
But what to do with it, I have no idea. Tell me what am I doing wrong?

UPDATE:
The error occurs when using dockerfile and context:
php-fpm:
# image: php:7.2-fpm
build:
context: ./
dockerfile: docker/php.docker

Building php-fpm
ERROR: Error processing tar file(exit status 1): write /frontend/web/img/products/8/some_image.jpg: no space left on device

And even if you leave only in docker/php.docker:

FROM php:7.2-fpm
WORKDIR /var/www

I apologize for the original error in the question from nginx, I'm just dancing with a tambourine and there was a config out of sync and an error

Answer 1

Yes, it's a matter of context. It turns out that it archives the entire project, including 15GB of images.
To exclude images from this process, you need to use dockerignore