This keyboard is not the same as foostan's Corne. It will not work with standard corne firmware.
Init container
git clone https://github.com/zmkfirmware/zmk.git
docker volume create --driver local -o o=bind -o type=none -o device="/absolute/path/to/zmk-cornish" zmk-config
devcontainer up --workspace-folder "/absolute/path/to/zmk"
docker exec -w /workspaces/zmk -it <container_id> /bin/bashInside the container
cd /workspaces/zmk-config
west init -l config
west update
make buildFirmware will be at build/eyelash_corne_<left|right>.uf2.