Fix Docker Compose build issue

[tgrycuk]

Resolved an issue preventing the Docker Compose build for the basic version of the Storefront.

After applying this fix, the following commands are sufficient to launch the basic version of the Storefront in a container.

git clone https://github.com/saleor/storefront.git .
cp .env.example .env
docker-compose build
docker-compose up

[vercel]

@tgrycuk is attempting to deploy a commit to the Saleor Commerce Team on Vercel.

A member of the Team first needs to authorize it.