Dockerfile

# Use Python 3.9 slim image
FROM python:3.9-slim

# Set the working directory
WORKDIR /app

# Install system dependencies required for OpenCV, pygame, and building packages.
RUN apt-get update && apt-get install -y \
    libgl1-mesa-glx \
    libglib2.0-0 \
    gcc \
    libcairo2-dev \
    pkg-config \
    python3-dev \
    libgirepository1.0-dev \
    gir1.2-gtk-3.0 \
    libsdl2-dev \
    libsdl2-image-dev \
    libsdl2-mixer-dev \
    libsdl2-ttf-dev \
    && rm -rf /var/lib/apt/lists/*

# Create a writable directory for fontconfig cache and set environment variables
RUN mkdir -p /tmp/fontconfig && chmod -R 777 /tmp/fontconfig
ENV FC_CACHEDIR=/tmp/fontconfig
ENV XDG_CACHE_HOME=/tmp

# Copy requirements.txt first to leverage Docker cache
COPY requirements.txt .

# Upgrade pip and install Python dependencies
RUN pip install --upgrade pip && pip install --no-cache-dir -r requirements.txt

# Explicitly install pygame (if not already in requirements.txt)
RUN pip install pygame

# Copy the rest of the application code into the container
COPY . .

# Expose the port (Flask default is 5000)
EXPOSE 5000

# Command to run the application
CMD ["python", "app.py"]