Making the header/title are a variable

Refactor Dockerfile and entrypoint script; add index.html.template and update example.env

Dockerfile

@@ -4,18 +4,25 @@ FROM python:3.9-slim
 # Set the working directory
 WORKDIR /app
 
-# Install dependencies
+# Install system dependencies (including gettext for envsubst)
+RUN apt-get update && apt-get install -y gettext && rm -rf /var/lib/apt/lists/*
+
+# Install Python dependencies
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Copy the application code
+# Copy the application code and template files
 COPY . .
 
+# Copy the entrypoint script into the container and make it executable
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
 # Set environment variables (can be overridden by .env)
 ENV FLASK_ENV=production
 
 # Expose the port (Gunicorn will run on 8000)
 EXPOSE 8000
 
-# Run the app with Gunicorn; use 3 workers (can be tuned via .env)
-CMD ["gunicorn", "--bind", "0.0.0.0:8000", "app:app", "--workers", "3"]
+# Use the entrypoint script as the container's command
+CMD ["/entrypoint.sh"]