add buildkit examples

buildkit/Dockerfile.buildkit-optimized

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+FROM node:20 AS build
+
+RUN corepack enable
+WORKDIR /app
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY . .
+RUN pnpm build
+
+FROM node:20-slim
+
+RUN apt-get update && apt-get install -y ca-certificates openssl && rm -rf /var/lib/apt/lists/*
+RUN corepack enable
+WORKDIR /app
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile --prod
+COPY --from=build /app/build /app/build
+ENV NODE_ENV production
+CMD ["node", "./build/server.js"]

buildkit/Dockerfile.not-optimized

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+FROM node:20
+
+RUN apt-get update && apt-get install -y ca-certificates openssl && rm -rf /var/lib/apt/lists/*
+RUN corepack enable
+WORKDIR /app
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY . .
+RUN pnpm build
+RUN rm -rf node_modules &&  pnpm install --frozen-lockfile --prod
+ENV NODE_ENV production
+CMD ["node", "./build/server.js"]

buildkit/README.md

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+# BuildKit
+
+This folder contains various examples that are used to walk through BuildKit concepts in blog posts on [Depot](https://depot.dev).

node/pnpm-fastify/Dockerfile.basic

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+FROM node:20
+
+RUN corepack enable
+
+COPY package.json pnpm-lock.yaml ./
+RUN pnpm install --frozen-lockfile
+COPY . .
+RUN pnpm build
+
+ENV NODE_ENV production
+CMD ["node", "./dist/index.js"]