My debian workstation runs sway on wayland, but the latest rpi-imager is actually a X11 only AppImage that needs to run as root. To run it, I hence need to:

• wrap it under policy kit authentication as no agent is running in the background
• allow X11
• pass some environment variables.

So:

xhost +SI:localuser:root
pkexec \
  env \
  DISPLAY=$DISPLAY \
  XAUTHORITY=$XAUTHORITY \
  QT_QPA_PLATFORM=xcb \
  rpi-imager