added systemd files

docker-updater.service

@@ -0,0 +1,8 @@
+[Unit]
+Description=Docker image and container update
+
+[Service]
+Type=oneshot
+WorkingDirectory=/root/docker/docker-updater
+ExecStart=/usr/bin/python3 /root/docker/docker-updater/update.py
+

docker-updater.timer

@@ -0,0 +1,11 @@
+[Unit]
+Description=Update docker daily
+
+[Timer]
+Unit=docker-updater.service
+OnCalendar=daily
+RandomizedDelaySec=1h
+OnBootSec=2min
+
+[Install]
+WantedBy=timers.target