build: 添加Dockerfile用于构建docker镜像

- 基于node:22-alpine构建docker镜像

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"]