fix permission issue with grades.sh

Author: JM-Lemmi

grades-docker/Dockerfile

@@ -9,6 +9,7 @@ RUN pip install git+https://github.com/TINF21CS1/python-campusnet@dev
 
 # Add crontab
 COPY grades.sh /app/grades.sh
+RUN chmod 777 /app/grades.sh; chmod +x /app/grades.sh
 RUN crontab -l /cron
 RUN echo "0 7-23 * * * /app/grades.sh" >> /cron
 RUN crontab /cron