Update Dockerfile

Dockerfile

@@ -2,41 +2,45 @@
 FROM node:20-alpine AS frontend
 WORKDIR /ui
 
+# Copy package files and install dependencies
 COPY frontend/package*.json ./
 RUN npm ci --silent || npm install --silent
 
+# Copy frontend source and build
 COPY frontend ./
 RUN npm run build
 
 # --- Backend Stage (FastAPI + Python) ---
-FROM python:3.11-bullseye  # Use full Debian, not slim
+# Use full Debian image for compatibility with Python packages
+FROM python:3.11-bullseye
 WORKDIR /app
 
-# Install system dependencies needed for Python packages
-RUN apt-get update && apt-get install -y \
-    build-essential \
-    git \
-    ffmpeg \
-    libsm6 \
-    libxext6 \
-    libsndfile1 \
-    && rm -rf /var/lib/apt/lists/*
-
-# Upgrade pip, setuptools, wheel
-RUN python -m pip install --upgrade pip setuptools wheel
-
-# Copy and install Python dependencies
+# Install system dependencies often required for Python packages
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        build-essential \
+        git \
+        ffmpeg \
+        libsm6 \
+        libxext6 \
+        cmake \
+        libgl1-mesa-glx \
+        python3-dev \
+        && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements and install Python dependencies
 COPY requirements.txt ./
+RUN pip install --upgrade pip
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy backend code
 COPY backend ./backend
 COPY app.py Procfile .env.example ./
 
-# Copy built frontend
+# Copy built frontend from frontend stage
 COPY --from=frontend /ui/dist ./frontend_dist
 
-# Bust cache
+# Bust cache so Hugging Face doesn’t reuse stale Node layers
 ARG CACHE_BUST=1
 
 EXPOSE 7860