Draw Stackup

Draw the PCB stackup. Needs KiCad 7 or newer. To specify the position and size of the drawing you can use two methods.
You can specify it using the pos_x, pos_y, width, height and layer options.
But you can also draw a rectangle in your PCB with the size and layer you want.
Then draw another thing inside the rectangle, select both and create a group (right mouse button, then Grouping -> Group). Now edit the group and change its name to kibot_stackup. After running this preflight the rectangle will contain the stackup