Add dockerfile

Dockerfile

@@ -0,0 +1,46 @@
+# =========================================
+# Stage 1: Build the TanStack Start Application
+# =========================================
+ARG NODE_VERSION=24.12.0-alpine
+
+# Use a lightweight Node.js image for building (customizable via ARG)
+FROM node:${NODE_VERSION} AS builder
+
+# Set the working directory inside the container
+WORKDIR /app
+
+# Copy package-related files first to leverage Docker's caching mechanism
+COPY package.json package-lock.json* ./
+
+# Install project dependencies using npm ci (ensures a clean, reproducible install)
+RUN npm ci
+
+# Copy the rest of the application source code into the container
+COPY . .
+
+# Build the TanStack Start application (outputs to /app/.output)
+RUN npm run build
+
+# =========================================
+# Stage 2: Run the TanStack Start Server
+# =========================================
+FROM node:${NODE_VERSION} AS runner
+
+# Set the working directory
+WORKDIR /app
+
+# Set environment variable for production
+ENV NODE_ENV=production
+ENV PORT=3000
+ENV HOST=0.0.0.0
+
+# Copy the built server and client assets from the builder stage
+COPY --from=builder /app/.output ./
+
+# Switch to the non-root user
+USER node 
+
+# Expose the application port
+EXPOSE 3000
+
+ENTRYPOINT ["node", "server/index.mjs"]