add update script (#67)

* add update script

* add crontab exemple

pyroengine/pi_utils/update_script.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# This script performs:
+# pull origin master
+#- if any change:
+#    kill container
+#	 rebuild docker compose
+# 
+# This script must be run with a crontab
+# */10 * * * * bash /home/pi/pyro-engine/pyroengine/pi_utils/update_script.sh
+
+
+CID=$(docker ps | grep server_web | awk '{print $1}')
+
+if [ `git -C /home/pi/pyro-engine pull origin master | grep -c "up to date."` -ne 1 ];
+    then
+        echo "pyro-engine updated from github";
+        cd /home/pi/pyro-engine/server/;
+        docker kill CID;
+        echo "rebuild docker";
+        PORT=8002 docker-compose up -d --build;
+    else
+        echo "pyro-engine up to date";
+fi;