build/index.js should actually do something now...

builder/index.js

@@ -1 +1,17 @@
-module.exports=function(e,r){"use strict";console.log("Hey!");};
+// Taken from: https://help.github.com/en/actions/automating-your-workflow-with-github-actions/creating-a-javascript-action#write-the-action-code
+
+const core = require('@actions/core');
+const github = require('@actions/github');
+
+try {
+  // `who-to-greet` input defined in action metadata file
+  const nameToGreet = core.getInput('who-to-greet');
+  console.log(`Hello ${nameToGreet}!`);
+  const time = (new Date()).toTimeString();
+  core.setOutput("time", time);
+  // Get the JSON webhook payload for the event that triggered the workflow
+  const payload = JSON.stringify(github.context.payload, undefined, 2)
+  console.log(`The event payload: ${payload}`);
+} catch (error) {
+  core.setFailed(error.message);
+}