Add Dofckerfile sveltekit node.md

Dofckerfile sveltekit node.md

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+This Dockerfile maximizes layer caching through `pnpm fetch` and multi-step dependencies installation.
+
+See https://pnpm.io/docker#example-3-build-on-cicd
+
+```dockerfile
+FROM node:22-alpine AS base
+ENV PNPM_HOME="/pnpm"
+ENV PATH="$PNPM_HOME:$PATH"
+RUN corepack enable
+WORKDIR /app
+
+# Fetch dependencies
+FROM base AS install
+COPY pnpm-lock.yaml ./
+RUN pnpm fetch
+
+COPY . .
+# Install production dependencies
+RUN pnpm install -r --offline --prod --frozen-lockfile
+
+# Install dev dependencies (needed for the build step)
+RUN pnpm install -r --offline --frozen-lockfile
+
+# Build
+ENV NODE_ENV=production
+RUN pnpm build
+
+ENTRYPOINT ["node", "build"]
+EXPOSE 3000
+```
+
+You can safely clean with `docker builder prune --f` after that. It won't touch the cache.