Add Docker

Use this skill when the user asks to dockerize, containerize, or add Docker support to an application.

Steps

1. Detect the runtime — inspect package.json, requirements.txt, go.mod, Cargo.toml, etc. to determine the language and runtime.

2. Create a multi-stage Dockerfile

   For Node.js (example):

   FROM node:20-alpine AS base
   
   FROM base AS deps
   WORKDIR /app
   COPY package.json package-lock.json ./
   RUN npm ci --omit=dev