add test apps

js-test-app/Dockerfile

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+# Development environment
+# -----------------------
+FROM node:latest
+WORKDIR /webpack
+
+COPY package*.json ./
+
+RUN npm install
+
+ENV NODE_ENV=development
+ARG SPONSOR
+
+COPY docker ./
+
+CMD node index.js

js-test-app/Procfile

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+web: node index.js

js-test-app/buildpack.yaml

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+version: v2
+name: js-test-app-buildpack
+services:
+- name: web
+  run: node index.js
+  type: web
+  port: 3000
+build:
+  context: ./
+  method: pack
+  builder: heroku/buildpacks:20
+  buildpacks:
+  - heroku/nodejs
+predeploy:
+  run: ls

js-test-app/dockerfile.yaml

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+version: v2
+name: js-test-app-dockerfile
+services:
+- name: web
+  run: node index.js
+  type: web
+  port: 3000
+build:
+  context: ./
+  method: docker
+  dockerfile: ./docker/Dockerfile
+predeploy:
+  run: ls

js-test-app/index.js

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+const express = require('express');
+const app = express();
+
+app.use(express.static('public'));
+
+app.get('/', (req, res) => {
+    res.send('Tetris time.');
+});
+
+var sponsor = process.env.SPONSOR || "unsponsored";
+app.listen(process.env.PORT || 3000, () => console.log('Tetris app listening on port 3000! Brought to you all by', sponsor + ", of course."));