Update Dockerfile

Dockerfile

@@ -1,24 +1,24 @@
-FROM python:3.9-slim
+FROM python:3.9
 
-# Create a non-root user for security
+# Create a non-root user for better security
 RUN useradd -m -u 1000 user
 USER user
 
-# Add pip user installs to PATH
+# Add the user's local bin to the PATH. This is where pip installs executables.
 ENV PATH="/home/user/.local/bin:$PATH"
 
-# Set working directory
+# Set the working directory inside the container
 WORKDIR /app
 
-# Copy and install dependencies
-COPY --chown=user requirements.txt .
+# Copy only the requirements.txt first to leverage Docker layer caching
+COPY --chown=user ./requirements.txt requirements.txt
+# Install the dependencies specified in requirements.txt
 RUN pip install --no-cache-dir --upgrade -r requirements.txt
 
-# Copy rest of the code
+# Copy the rest of your application code into the container
 COPY --chown=user . /app
 
-# Expose port (optional, but good practice)
-EXPOSE 7860
-
-# Start Gunicorn server
-CMD ["gunicorn", "-b", "0.0.0.0:7860", "app:app"]
+# The CMD instruction tells Docker how to run your application.
+# This command starts the Gunicorn server, binding it to port 7860 on all network interfaces,
+# and points it to the 'app' object inside your 'app.py' file.
+CMD ["gunicorn", "-b", "0.0.0.0:7860", "app:app"]