Add Dockerfile SvelteKit Node.md

Dockerfile SvelteKit Node.md

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+This Dockerfile maximizes layer caching usage for SvelteKit apps (node adapter).
+
+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 --offline --prod --frozen-lockfile
+
+# Install dev dependencies (needed for the build step)
+RUN pnpm install --offline --frozen-lockfile
+
+# Build the app
+ENV NODE_ENV=production
+RUN pnpm build
+
+ENTRYPOINT ["node", "build"]
+EXPOSE 3000
+```
+
+You can then safely execute `docker builder --prune -f` to clean without destroying the cache.