Fix docker logs output by creating the logfile first

entry.sh

@@ -1,6 +1,7 @@
 #!bin/sh
 set -e
 
+echo "Starting container ..."
 
 if [ -n "${NFS_TARGET}" ]; then
     echo "Mounting NFS based on NFS_TARGET"
@@ -15,6 +16,12 @@ fi
 echo "Setup backup cron job with cron expression: ${BACKUP_CRON}"
 echo "${BACKUP_CRON} /bin/backup >> /var/log/cron.log 2>&1" > /var/spool/cron/crontabs/root
 
+# Make sure the file exists before we start tail
+touch /var/log/cron.log
+
 # start the cron deamon
 crond
-tail -f /var/log/cron.log
+
+echo "Container started."
+
+tail -fn0 /var/log/cron.log