Add an example project with dockerfile - 1st draft

sections/examples/dockerfile/.dockerignore

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+node_modules/
+.git
+README.md
+LICENSE
+.vscode
+.idea
+npm-debug.log
+coverage
+.env
+.editorconfig
+.aws
+dist
+.npmrc

sections/examples/dockerfile/Dockerfile

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+FROM node:14.8.0-alpine AS build
+
+# Copy dependency information and install all dependencies
+COPY --chown=node:node package.json package-lock.json ./
+
+RUN npm ci
+
+# Copy source code (and all other relevant files)
+COPY --chown=node:node src ./src
+
+# Build code
+RUN npm run build
+
+# Run-time stage
+FROM node:14.8.0-alpine
+
+# Set non-root user and expose port 3000
+USER node
+EXPOSE 3000
+
+WORKDIR /home/node/app
+
+# Copy dependency information and build results from previous stage
+COPY --chown=node:node --from=build package.json package-lock.json ./
+COPY --chown=node:node --from=build node_modules ./node_modules
+COPY --chown=node:node --from=build dist ./dist
+
+# Clean dev packages
+RUN npm prune --production
+
+CMD [ "node", "dist/app.js" ]

sections/examples/dockerfile/package.json

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+{
+  "name": "node-app-with-docker",
+  "version": "1.0.0",
+  "description": "An example node app that uses docker to be built",
+  "main": "src/app.ts",
+  "scripts": {
+    "run": "dist/app.js",
+    "build": "tsc --outDir dist -m commonjs -t ES2020 src/app.ts",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/goldbergyoni/nodebestpractices.git"
+  },
+  "author": "",
+  "license": "ISC",
+  "bugs": {
+    "url": "https://github.com/goldbergyoni/nodebestpractices/issues"
+  },
+  "homepage": "https://github.com/goldbergyoni/nodebestpractices#readme",
+  "dependencies": {
+    "koa": "^2.13.0"
+  },
+  "devDependencies": {
+    "@types/koa": "^2.11.4",
+    "typescript": "^3.9.7"
+  }
+}

sections/examples/dockerfile/src/app.ts

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+import * as Koa from 'koa';
+const app = new Koa();
+
+app.use(async ctx => {
+    ctx.body = 'Hello World';
+});
+
+app.listen(3000, () => {
+    console.log('Navigate to http://localhost:3000');
+});