Update Dockerfile

Dockerfile

@@ -1,28 +1,36 @@
-# Use a Python base image
+# Use a Python base image suitable for slim deployments
 FROM python:3.9-slim
 
 # Set the working directory in the container
 WORKDIR /app
 
-# Create a writable directory for Hugging Face cache
+# --- Handle caching for Sentence-Transformers and Hugging Face models ---
+# Create a writable directory for the Hugging Face cache
+# Ensure permissions allow the application user (root by default in this base image) to write
 RUN mkdir -p /app/.cache && chmod 777 /app/.cache
-# Set the cache environment variable
+# Set the environment variable to tell Hugging Face libraries where to cache models
 ENV HUGGINGFACE_HUB_CACHE="/app/.cache"
 
-# Copy the requirements file and install dependencies
+# --- Install Dependencies ---
+# Copy the requirements file first to leverage Docker cache layers
 COPY requirements.txt .
+# Install the Python dependencies
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Copy the rest of the application code
-# Explicitly copy directories to ensure they land in /app/templates and /app/static
+# --- Copy Application Code ---
+# Copy the rest of the application code into the working directory
+# Explicitly copy directories to ensure they land in the correct place relative to /app
 COPY app.py .
 COPY templates /app/templates
 COPY static /app/static
-COPY README.md . # Ensure README is copied too
+# Copy the README file - Corrected: comment moved to its own line
+COPY README.md .
 
-
-# Expose the port the app runs on (Hugging Face requires 7860 for web apps)
+# --- Configure Application Startup ---
+# Expose the port the Flask app will run on. Hugging Face Spaces Docker requires 7860.
 EXPOSE 7860
 
 # Define the command to run your application using Waitress
+# Waitress serves the 'app' object from your 'app.py' file
+# It listens on all interfaces (0.0.0.0) on port 7860
 CMD ["waitress-serve", "--listen=0.0.0.0:7860", "app:app"]