prometheus-node-exporter-lua: add test / skip test-version

test.sh is pretty basic and will not fail if one of the plugin fails,
which is fine as most plugins will fail in CI anyway.

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

utils/prometheus-node-exporter-lua/test-version.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+exit 0

utils/prometheus-node-exporter-lua/test.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# shellcheck shell=busybox
+
+case "$PKG_NAME" in
+prometheus-node-exporter-lua-openwrt)
+	# call ubus outside scape, so skip the check
+	exit 0
+	;;
+
+*)
+	prometheus-node-exporter-lua | grep node_scrape_collector_success
+	;;
+esac