fix imagemagick policy

main.py

@@ -134,7 +134,7 @@ pinned: false
 ---"""
         dockerfile = """FROM python:3.10-slim
 RUN apt-get update && apt-get install -y imagemagick ffmpeg && rm -rf /var/lib/apt/lists/*
-RUN sed -i 's|<policy domain="path" rights="none" pattern="@\*"/>||g' /etc/ImageMagick-6/policy.xml || true
+RUN sed -i "s/rights=\"none\"/rights=\"read|write\"/g" /etc/ImageMagick-7/policy.xml || true
 WORKDIR /app
 COPY requirements.txt .
 RUN pip install -r requirements.txt