Update Dockerfile

Dockerfile

@@ -9,6 +9,10 @@ RUN apt-get update && apt-get install -y \
     curl \
     ca-certificates
 
+# Install system dependencies (poppler-utils is required by pdf2image).
+RUN apt-get update && apt-get install -y poppler-utils && rm -rf /var/lib/apt/lists/*
+
+
 # Create a new user to run the app
 RUN useradd -m -u 1000 user
 USER user