Storefront does not find assets

Hello!

I have just installed Shopware 6 on a Ubuntu Server, via docker.
I have also developed a custom theme for my shop.
When entering on the main page, I have many 404 error codes on pictures.
I have worked on this custom theme on my local machine and everything is looking fine.

I can’t find out what exactly I missed on installation and why these files are missing.
If I manually upload the files into the directories listed on errors, after I run build-storefront the files are gone again.
The project is installed in var/www/html/public/shop and maybe webpack doesn’t create the correct paths, I don’t know.

Thanks.