[feature] Dorcker file

- Use node 20 "slim"
- install pnpm and pm2 using npm

.dockerignore

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+node_modules/
+.git/
+.github/
+.vscode/

Dockerfile

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+# https://expressjs.com/en/advanced/best-practice-performance.html
+# https://javascript.plainenglish.io/build-a-production-ready-node-express-api-with-docker-9a45443427a0
+# https://pm2.keymetrics.io/docs/usage/docker-pm2-nodejs/
+
+# docker build -t epflsi/startpage .
+# docker run -it epflsi/startpage bash
+# docker run -e PORT=1337 -p 3000:1337 epflsi/startpage -d
+
+FROM node:20-slim
+
+# RUN apt-get -qq update && apt-get -qq -y --no-install-recommends install curl
+# RUN apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false
+RUN npm install -g pnpm pm2
+
+RUN mkdir -p /home/node/app/src
+WORKDIR /home/node/app
+
+COPY package*.json ./
+RUN pnpm i --only=production
+COPY ./src ./src
+
+# Set internal port
+ENV PORT=1337
+# Open desired port
+EXPOSE 3000
+
+# It's a production Docker
+ENV NODE_ENV=production
+
+# Use pm2 to run the application
+ENTRYPOINT ["pm2-runtime", "./src/server.js"]