Small problem with the Crankshaft Docker Build:

Setting up python3-colorzero (1.1) ...
Setting up python3-rpi.gpio (0.7.0-0.1bpo10+4) ...
Setting up python3-spidev (20200602200721-1~buster) ...
Setting up zip (3.0-11) ...
Setting up python3-gpiozero (1.6.2-1) ...
Setting up python-smbus:armhf (4.1-1) ...
Processing triggers for man-db (2.8.5-2) ...
[18:55:16] End /pi-gen/stage3/03-crankshaft-base/00-packages
[18:55:16] Begin /pi-gen/stage3/03-crankshaft-base/00-run.sh
cp: cannot stat '/pi-gen/prebuilts/udev/51-android.rules': No such file or directory

Any thoughts appreciated.