Determine the best way to set the screen resolution

The virtualbox services don't seem to be able to do it on the guest

The virtual machine doesn't have any properties to set a screen resolution, and it needs to be changed while running (not great for vagrant).

Maybe just a xrandr command for xorg based DEs, and custom commands for Wayland/other DEs ?

By default it looks like virtualbox is set up to display in 800x600 when running in headless mode, so it should be fine.