Update Dockerfile

Dockerfile

@@ -1,26 +1,25 @@
-# Use an official Node.js runtime as the base image
+# Dockerfile for Hugging Face Spaces (single file)
 FROM node:18-alpine
 
-# Set working directory inside the container
+# set working dir
 WORKDIR /app
 
-# Copy package.json and package-lock.json first (for caching)
+# copy package files and install (use npm ci if you have package-lock.json)
 COPY package*.json ./
-
-# Install dependencies
 RUN npm install
 
-# Copy the rest of the project files
+# copy source and build
 COPY . .
-
-# Build the app for production
 RUN npm run build
 
-# Install a simple static file server to serve the built files
+# install a tiny static server
 RUN npm install -g serve
 
-# Expose the port your app will run on
+# default port (Hugging Face will inject its PORT env var at runtime)
+ENV PORT=3000
+
+# expose the port (optional; for documentation)
 EXPOSE 3000
 
-# Command to run the app
-CMD ["serve", "-s", "build", "-l", "3000"]
+# bind to 0.0.0.0 and use the PORT env var; sh -c is used so ${PORT} expands
+CMD ["sh", "-c", "serve -s build -l 0.0.0.0:${PORT}"]