tweaks to docker smoke

scripts/docker-onboard-smoke.sh

@@ -9,6 +9,7 @@ DATA_DIR="${DATA_DIR:-$REPO_ROOT/data/docker-onboard-smoke}"
 HOST_UID="${HOST_UID:-$(id -u)}"
 PAPERCLIP_DEPLOYMENT_MODE="${PAPERCLIP_DEPLOYMENT_MODE:-authenticated}"
 PAPERCLIP_DEPLOYMENT_EXPOSURE="${PAPERCLIP_DEPLOYMENT_EXPOSURE:-private}"
+PAPERCLIP_PUBLIC_URL="${PAPERCLIP_PUBLIC_URL:-http://localhost:${HOST_PORT}}"
 DOCKER_TTY_ARGS=()
 
 if [[ -t 0 && -t 1 ]]; then
@@ -27,6 +28,7 @@ docker build \
 
 echo "==> Running onboard smoke container"
 echo "    UI should be reachable at: http://localhost:$HOST_PORT"
+echo "    Public URL: $PAPERCLIP_PUBLIC_URL"
 echo "    Data dir: $DATA_DIR"
 echo "    Deployment: $PAPERCLIP_DEPLOYMENT_MODE/$PAPERCLIP_DEPLOYMENT_EXPOSURE"
 echo "    Live output: onboard banner and server logs stream in this terminal (Ctrl+C to stop)"
@@ -38,5 +40,6 @@ docker run --rm \
   -e PORT=3100 \
   -e PAPERCLIP_DEPLOYMENT_MODE="$PAPERCLIP_DEPLOYMENT_MODE" \
   -e PAPERCLIP_DEPLOYMENT_EXPOSURE="$PAPERCLIP_DEPLOYMENT_EXPOSURE" \
+  -e PAPERCLIP_PUBLIC_URL="$PAPERCLIP_PUBLIC_URL" \
   -v "$DATA_DIR:/paperclip" \
   "$IMAGE_NAME"