Update Dockerfile

Dockerfile

@@ -5,10 +5,15 @@ FROM python:3.10-slim
 ENV DEBIAN_FRONTEND=noninteractive
 
 # Install system dependencies
-# - Essential for Pillow image processing: libgl1-mesa-glx, libglib2.0-0
-# - Font handling: fontconfig
-# - Installs Microsoft Core Fonts (including Arial): ttf-mscorefonts-installer
 RUN apt-get update && \
+    # Modify sources.list to include contrib and non-free-firmware.
+    # This is necessary for packages like ttf-mscorefonts-installer on Debian Bookworm.
+    # The sed command appends 'contrib non-free-firmware' to lines that already contain 'main'.
+    sed -i 's/main$/main contrib non-free-firmware/g' /etc/apt/sources.list && \
+    # It's also good to ensure security updates are prioritized if specific lines exist for them
+    # sed -i 's/main$/main contrib non-free-firmware/g' /etc/apt/sources.list.d/debian.sources || true && \
+    # Re-run apt-get update to fetch package lists from the newly enabled components
+    apt-get update && \
     apt-get install -y --no-install-recommends \
     libgl1-mesa-glx \
     libglib2.0-0 \
@@ -48,8 +53,8 @@ RUN pip install --no-cache-dir -r requirements.txt
 # Ensure 'appuser' owns these copied files.
 COPY --chown=appuser:appuser app.py .
 
-# The line to copy 'arial.ttf' has been REMOVED.
-# We will now rely on the system-installed Arial from 'ttf-mscorefonts-installer'.
+# The line to copy 'arial.ttf' was previously REMOVED.
+# We are relying on the system-installed Arial from 'ttf-mscorefonts-installer'.
 
 # Copy the entire 'templates' directory (and its contents) from your repository root
 # to /app/templates inside the container.