STARTX runner

Creates the local-console X startup wiring used by a kiosk profile. Modes are preflight, apply, and disable.

Local-console STARTX wrapper

wget -qO- https://devs-guide.github.io/debian/setup/cli/startx.sh | \
  env DEBIAN_STARTX_MODE=apply \
      DEBIAN_STARTX_ENABLE=1 \
      DEBIAN_STARTX_USER=app \
      DEBIAN_STARTX_TTY=tty1 \
      DEBIAN_STARTX_DISPLAY=:0 \
      DEBIAN_STARTX_INSTALL_PACKAGES=1 \
      DEBIAN_STARTX_MANAGE_XWRAPPER=1 \
      DEBIAN_STARTX_MANAGE_XINITRC=1 \
      DEBIAN_STARTX_MANAGE_WRAPPER=1 \
      DEBIAN_STARTX_WRAPPER_PATH=/usr/local/bin/kiosk-startx \
      DEBIAN_STARTX_OPENBOX_COMMAND=/usr/bin/openbox-session \
      bash

Variable	Purpose
`DEBIAN_STARTX_USER` / `DEBIAN_STARTX_TTY` / `DEBIAN_STARTX_DISPLAY`	Defines the local console identity and X display.
`DEBIAN_STARTX_MANAGE_XWRAPPER`	Manages the Xorg wrapper policy needed for the intended console user.
`DEBIAN_STARTX_MANAGE_XINITRC` / `DEBIAN_STARTX_MANAGE_WRAPPER`	Creates the managed startup files and wrapper.
`DEBIAN_STARTX_OPENBOX_COMMAND`	Application/session command executed at the end of the managed X startup.
`DEBIAN_STARTX_SERVER_ARGS`	Optional X-server arguments; the default disables TCP listening.

The managed wrapper defaults to /usr/local/bin/kiosk-startx; it is intended for a local console session, not for starting an X server over SSH.