Fix: dos2unix for line endings in start.sh

Dockerfile.render

@@ -5,6 +5,7 @@ WORKDIR /app
 # Install system dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
+    dos2unix \
     && rm -rf /var/lib/apt/lists/* \
     && apt-get clean
 
@@ -19,8 +20,8 @@ COPY . .
 # Create workspace directories
 RUN mkdir -p /app/workspace_data /app/chroma_db
 
-# Make startup script executable
-RUN chmod +x /app/start.sh
+# Fix line endings and make startup script executable
+RUN dos2unix /app/start.sh && chmod +x /app/start.sh
 
 # Render requires port 10000
 EXPOSE 10000