Update permissions on Dockerfile

Dockerfile

@@ -7,6 +7,9 @@ USER root
 # Create necessary directories for Grobid
 RUN mkdir -m 777 -p /opt/grobid/grobid-home/tmp
 
+# Give permissions to the default supervisord log directory
+RUN mkdir -p /var/log/supervisor && chmod -R 777 /var/log/supervisor
+
 # Install supervisord and python (for gradio)
 RUN apt-get update && apt-get install -y supervisor python3 python3-pip && rm -rf /var/lib/apt/lists/*