Added matrix notification

src/checkmk/install-service.sh

@@ -28,3 +28,10 @@ a2ensite default-ssl
 systemctl restart apache2.service
 
 omd start $CMK_INSTANCE
+
+# install matrix notification plugin
+su - $CMK_INSTANCE
+cd ~/local/share/check_mk/notifications/
+wget https://github.com/bashclub/check_mk_matrix_notifications/raw/master/matrix.py
+chmod +x ./matrix.py
+exit