X11 or Wayland/Weston on RPi 4 - docker sample image?

I’m looking for a sample Dockerfile that will run a lean/lightweight install of X11 or Wayland that I can then run a GTK3 application on top of. I’ve been messing around but couldn’t find a good reference for an up-to-date installation. I’m using RPi4 (actually CM4 on IO Board), and my host is running fine with VC4 kernel driver, etc.