chore: optimize Dockerfile

Dockerfile

@@ -16,12 +16,15 @@ RUN apt-get update && apt-get install -y \
 # Fix security policy for ImageMagick
 RUN sed -i '/<policy domain="path" rights="none" pattern="@\*"/d' /etc/ImageMagick-6/policy.xml
 
-# Copy the current directory contents into the container at /MoneyPrinterTurbo
-COPY . .
+# Copy only the requirements.txt first to leverage Docker cache
+COPY requirements.txt ./
 
 # Install Python dependencies
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Now copy the rest of the codebase into the image
+COPY . .
+
 # Expose the port the app runs on
 EXPOSE 8501