Add minimal __prometheus_node_exporter type

type/__prometheus_node_exporter/manifest

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+os="$(cat "${__global:?}/explorer/os")"
+case "$os" in
+	alpine)
+		__package prometheus-node-exporter
+		require="__package/prometheus-node-exporter" \
+			__start_on_boot node-exporter
+		require="__package/prometheus-node-exporter" \
+			__service node-exporter --action start
+		;;
+	debian|ubuntu)
+		__package prometheus-node-exporter
+		;;
+	*)
+		echo "This type does not supper $os. Exiting." >&2
+		exit 1
+		;;
+esac