Robinson Linux is the minimalistic Linux distribution created from scratch using minimum tools.

To create the build environment run:

$ sudo docker build -t robinson-linux-builder .

To create SD card image of Robinson Linux run:

$ sudo docker run -it --rm --privileged -v $(pwd):/workspace robinson-linux-builder

To write image to SD card run:

$ sudo dd robinson-linux.img of=/dev/mmcblk0 status=progress bs=10M

$ sudo sync

where /dev/mmcblk0 is the block device which represents SD card. It can be /dev/sda, /dev/sdb or other if you use USB adapter.

If you are uncomfortable with dd you can use balenaEtcher or other tool to write image to SD card.