install chrony

automatically disables systemd-timesyncd.service
fixes #3

post-debootstrap-installer.sh

@@ -67,6 +67,14 @@ apt-get -y install iproute2
 systemctl enable systemd-networkd.service
 
 
+
+### ntp
+
+# automatically disables systemd-timesyncd.service
+apt-get -y install chrony
+
+
+
 ### Docker
 # has to be executed before the users section,
 # because otherwise the docker group doesn't exist