Prep kiosk-app for submodule split

serving/docker-compose.yml

@@ -191,11 +191,15 @@ services:
 
   # --- Kiosk SPA (spaceship terminal shown by the diskless kiosk) ------------
   # Svelte + Tailwind app built into a static bundle served by its own nginx.
-  # Bridge-networked (NOT host) so it doesn't fight :80; published on loopback
-  # only, where the host-network 'http' nginx reverse-proxies /kiosk/ to it.
-  # Build: docker compose build kiosk
+  # Now an INDEPENDENT project — the `kiosk-app` git submodule (its own repo +
+  # CI). It builds + pushes its own image (git.../fleet-kiosk); the serving stack
+  # pulls it, like dnsmasq/SPDK. Bridge-networked (NOT host) so it doesn't fight
+  # :80; published on loopback only, where the host-network 'http' nginx
+  # reverse-proxies /kiosk/ to it.
   kiosk:
-    build: ./kiosk-app
+    image: ${KIOSK_IMAGE}:${KIOSK_VERSION}
+    # Local dev from the submodule working tree instead of pulling:
+    # build: ./kiosk-app
     restart: unless-stopped
     ports:
       - "127.0.0.1:${KIOSK_APP_PORT:-8088}:80"   # loopback only; main nginx proxies here