comp review todo app update (#146)

* new todo frontend

* yarn --> npm

* basic Dockerfile

* add Helm chart for todo list

* backend working

* connect new-app'd frontend to backend via proxy_pass

* move nginx conf

* move nginx conf back

* move helm chart to course repo

* add simple SSR node.js service

* log error message

* fix host typo

* fix dockerfiles

* add link to items page

* improve probe route for todo-backend

* canary probe route for todo-backend

* Dockerfile -> Containerfile todo-backend

* Dockerfile -> Containerfile todo-frontend

* remove commands for containerfile as part of comp review

todo-ssr/index.js

@@ -0,0 +1,30 @@
+const express = require("express");
+const axios = require("axios");
+
+const port = Number(process.env.PORT || 8080);
+const apiHost = process.env.API_HOST || "localhost:3000";
+
+const app = express();
+
+app.set("view engine", "pug");
+
+app.get("/", (req, res) => {
+  res.render("index", { title: "Hello", message: "Page message" });
+});
+
+app.get("/items", async (req, res) => {
+  try {
+    const items = await axios
+      .get(`${apiHost}/api/items`)
+      .then((response) => response.data);
+    console.log("items:", items);
+    res.render("items", { items });
+  } catch (err) {
+    console.error(err);
+    res.status(500).send(err.message);
+  }
+});
+
+app.listen(port, () => {
+  console.log("Express server started on port: " + port);
+});