Update Dockerfile

added cron for backup, needs to be adjustet to the time when the backup is started if other backuo solution is used (use case for external backuo suite like duplicati etc)

Dockerfile

@@ -11,10 +11,14 @@ ADD papermc.sh .
 ADD backup.sh .
 ADD restore.sh .
 RUN apt-get update \
-    && apt-get install wget curl jq webp screen grep -y \
+    && apt-get install wget curl jq webp screen cron -y \
     && rm -rf /var/lib/apt/lists/* \
     && mkdir /papermc \
     && mkdir /backup
+RUN crontab -l > mycron \
+	&& echo "59 05 * * * screen -r mc -p 0 -X stuff "save-off^M"" >> mycron \
+	&& crontab mycron \
+	&& rm mycron
 
 # Start script
 CMD ["sh", "./papermc.sh"]