build: 添加Dockerfile用于构建docker镜像

- 基于node:22-alpine构建docker镜像

.dockerignore

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+# ------------------------
+# Node / Package Manager
+# ------------------------
+node_modules
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+.pnpm-store
+
+# Nuxt build outputs
+.output
+.nuxt
+dist
+.cache
+.unimport
+.h3
+.nitro
+**/.nitro
+
+# Dev tools / OS files
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs
+!.gitkeep
+
+# Local env files (runtime env should be provided by Docker/K8s)
+.env
+.env.*
+!.env.example
+
+# Git
+.git
+.gitignore
+.gitattributes
+
+# Editor / IDE
+.vscode
+.idea
+*.swp
+*.swo
+
+# Tests
+coverage
+*.lcov
+
+# Docker
+Dockerfile*
+docker-compose.yml
+
+# CI / Local build artifacts
+*.tgz
+*.zip
+*.tar
+*.mdx

Dockerfile

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+ -------- Base image --------
+FROM node:22-alpine AS base
+ENV NODE_ENV=production
+WORKDIR /app
+
+# -------- Dependencies layer -------
+FROM base AS deps
+WORKDIR /app
+
+RUN corepack enable
+
+# Copy package.json and lockfile
+COPY package.json pnpm-lock.yaml .npmrc ./
+
+# Install dependencies with cache
+RUN --mount=type=cache,target=/root/.local/share/pnpm/store pnpm install
+
+# -------- Build layer -------
+FROM deps AS build
+# Copy entire project
+COPY  . ./
+
+ENV NITRO_PRESET=node-server
+
+# Build the project
+RUN pnpm run build
+
+# ------- Runtime layer -------
+FROM base AS runtime
+WORKDIR /app
+
+# COPY .output folder
+COPY --from=build /app/.output ./
+
+ENV PORT=3000
+ENV NITRO_PRESET=node-server
+ENV HOST=0.0.0.0
+
+EXPOSE 3000
+
+CMD ["node", "/app/server/index.mjs"]