add metrics and sample node.js function

sample-functions/Dockerfile

@@ -0,0 +1,9 @@
+FROM alpine:latest
+RUN apk --update add nodejs
+COPY ./fwatchdog /usr/bin/
+
+COPY package.json .
+COPY main.js .
+RUN npm i
+ENV fprocess="node main.js"
+CMD ["fwatchdog"]

sample-functions/main.js

@@ -0,0 +1,3 @@
+'use strict'
+let os = require('os');
+console.log(os.platform(), os.arch(), os.cpus(), os.uptime(), os.userInfo());

sample-functions/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "sample-functions",
+  "version": "1.0.0",
+  "description": "",
+  "main": "main.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC"
+}