chore: remove trailing whitespace from README.md line 42

Dockerfile

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+# Use the latest Python 3.13 slim image for a lightweight base
+FROM python:3.13-slim
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1
+ENV PYTHONDONTWRITEBYTECODE=1
+
+# Set work directory
+WORKDIR /app
+
+# Install system dependencies if needed (for Dulwich, etc.)
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements file
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy project
+COPY . .
+
+# Expose port
+EXPOSE 9001
+
+# Run the application
+CMD ["python", "-m", "retoors.main", "--host", "0.0.0.0", "--port", "9001"]