added docker

Dockerfile

@@ -6,8 +6,10 @@ FROM node:18-bullseye-slim AS builder
 WORKDIR /app
 
 # install build deps and copy package files first for caching
+# NOTE: this repository uses pnpm lockfile but no package-lock.json; `npm ci` requires
+# a package-lock.json and will fail. Use `npm install` so the image builds reliably.
 COPY package*.json ./
-RUN npm ci --silent
+RUN npm install --silent
 
 # copy source and build
 COPY . ./
@@ -17,7 +19,6 @@ FROM node:18-bullseye-slim AS runner
 WORKDIR /app
 
 ENV NODE_ENV=production
-ENV PORT=3000
 
 # minimal packages for certificates (if needed by model download / https)
 RUN apt-get update && apt-get install -y ca-certificates --no-install-recommends && rm -rf /var/lib/apt/lists/*
@@ -27,12 +28,15 @@ COPY --from=builder /app/package*.json ./
 COPY --from=builder /app/node_modules ./node_modules
 COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/public ./public
-COPY --from=builder /app/next.config.js ./next.config.js
+COPY --from=builder /app/next.config.mjs ./next.config.mjs
 
-# Expose the port the app will run on (Spaces expects the app to listen on this port)
+# Expose a common port (informational). Hugging Face Spaces will inject $PORT at runtime
+# and the CMD below ensures Next listens on that port. Do not hardcode PORT here.
 EXPOSE 3000
 
 # If you use private/gated HF models, set HF_TOKEN in the Space secrets and expose here
 # e.g. in Space settings: add secret HF_TOKEN with your token
 
-CMD ["npm", "run", "start"]
+# Ensure `next start` uses the $PORT provided by the Spaces runtime. We use a shell
+# wrapper so the environment variable is expanded at container runtime.
+CMD ["sh", "-c", "npm run start -- -p ${PORT:-3000}"]