How to load Wifi driver into MinimalCD USB drive

My intention: I want to install https://help.ubuntu.com/community/Installation/MinimalCD
The reason is, I don’t need most of the tools that come by default. I can just install i3 and xinit and I’ll feel right at home.

The problem: I own a Dell XPS 13 (9360) which requires the linux-firmware package because it has the required wifi drivers. Without that, the installation can’t proceed.

My question: How can I customize the mini installation drive so that it loads the linux-firmware package during the installation and in doing so, recognizes my wireless card?

Thanks.

This site is for the co-ordination of the Ubuntu project(s), and not support.

For Ubuntu Support options, including custom install questions like yours, please have a look at https://community.ubuntu.com/t/finding-help/712