Upload and test

00-Lesson-Site/frontend/Dockerfile

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+# Base Image
+FROM node:22-alpine AS base
+WORKDIR /app
+
+# Enable pnpm
+RUN corepack enable && corepack prepare pnpm@latest --activate
+
+# Copy manifest files first to cache dependencies
+COPY pnpm-lock.yaml package.json ./
+
+# Install dependencies
+RUN pnpm install
+
+# --- Development Stage ---
+FROM base AS development
+COPY . .
+# Astro default port
+EXPOSE 4321 
+# --host is required to expose the server to the container
+CMD ["pnpm", "dev", "--host"]
+
+# --- Build Stage ---
+FROM base AS build
+COPY . .
+RUN pnpm build
+
+# --- Production Stage ---
+FROM base AS production
+WORKDIR /app
+
+# We install 'serve' globally here so we don't rely on node_modules
+# This keeps the final image smaller/cleaner
+RUN npm install -g serve
+
+# Copy the built output from the build stage
+# Astro outputs to 'dist' by default
+COPY --from=build /app/dist ./dist
+COPY serve.json ./dist
+
+# Expose the port you want for production (e.g., 3000 or 80)
+EXPOSE 3000
+
+CMD ["serve", "dist", "-l", "3000", "--single", "--config", "serve.json"]