buildx failed with: ERROR: failed to solve: process "/bin/sh -c echo \"$USER\" && whoami && mkdir -p /home/pi/device-backend-logs/processing/segmenter && ls -l /home && ls -l /home/pi && ls -l /home/pi/device-backend-logs && ls -l /home/pi/device-backend-logs/processing && chown -R pi:pi /home/pi && echo \"Every time the Python backend's segmenter starts, it should create a new file in this directory.\" >> /home/pi/device-backend-logs/processing/segmenter/README" did not complete successfully: exit code: 1