You could download the latest develop build from Github Actions
https://github.com/solosky/pixl.js/actions
You could build the firmware using customized Docker image.
# create containers
docker run -it --rm solosky/nrf52-sdk:latest
# init repository
root@b10d54636088:/builds# git clone https://github.com/solosky/pixl.js
root@b10d54636088:/builds# cd pixl.js
root@b10d54636088:/builds/pixl.js# git submodule update --init --recursive
# build LCD version
root@b10d54636088:/builds/pixl.js# cd fw && make all BOARD=LCD RELEASE=1
# build OLED version
root@b10d54636088:/builds/pixl.js# cd fw && make all BOARD=OLED RELEASE=1
The firmware is fw/_build/pixjs_all.hex,ota package is fw/_build/pixjs_ota_vXXXX.zip