Docker and more calendar work

Dockerfile

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+# Use Python 3.8 as the base image
+FROM python:3.8-slim
+
+# Set working directory
+WORKDIR /app
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    FLASK_ENV=production
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements file and install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the application code
+COPY . .
+
+# Create necessary directories
+RUN mkdir -p instance downloads
+
+# Make sure the application has the right permissions
+RUN chmod -R 755 .
+
+# Expose the port the app runs on
+EXPOSE 5000
+
+# Make the entrypoint script executable
+COPY docker-entrypoint.sh .
+RUN chmod +x docker-entrypoint.sh
+
+# Set the entrypoint
+ENTRYPOINT ["./docker-entrypoint.sh"]