Update Dockerfile

Dockerfile

@@ -3,35 +3,28 @@ FROM python:3.9-slim
 
 # Create a dedicated, non-root user for security.
 RUN useradd -m -u 1000 user
-
-# Switch to this new user.
 USER user
 
-# Set environment variables that will be available to the 'user'.
+# Set environment variables
 ENV HOME=/home/user
-
-# --- THIS IS THE FIX ---
-# Add the user's local binary directory to the system's PATH.
-# This ensures that executables installed by pip (like uvicorn) can be found.
 ENV PATH=$HOME/.local/bin:$PATH
-
-# Set the cache directory for transformers.
 ENV TRANSFORMERS_CACHE=$HOME/.cache
-
-# Set the working directory for the application.
 WORKDIR $HOME/app
 
-# Copy and own the requirements file.
+# Copy the requirements file
 COPY --chown=user:user ./requirements.txt .
 
-# Install Python dependencies.
+# --- BUILD FIX ---
+# 1. Upgrade pip itself and install the key build-time dependency first.
+RUN pip install --no-cache-dir --upgrade pip setuptools
+RUN pip install --no-cache-dir packaging
+
+# 2. Now, install all the other requirements. pip will now find 'packaging'.
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
-# Copy and own the application file.
+# Copy the rest of the application
 COPY --chown=user:user ./app.py .
 
-# Expose the port the app will run on.
+# Expose the port and run the application
 EXPOSE 7860
-
-# Command to run your app. Now 'uvicorn' can be found in the PATH.
 CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]