post https://yourServer.jamfcloud.com/JSSResource/dockitems/id/
<dock_item>
<name>Safari</name>
<type>App</type>
<path>file://localhost/Applications/Safari.app/</path>
<contents>string</contents>
</dock_item>
<dock_item>
<name>Safari</name>
<type>App</type>
<path>file://localhost/Applications/Safari.app/</path>
<contents>string</contents>
</dock_item>