event manager: add Certificate renewal trigger

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

templates/webadmin/eventaction.html

@@ -511,7 +511,7 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
             </div>
             <div class="modal-body">
                 <p>
-                    <span class="shortcut"><b>{{`{{Name}}`}}</b></span> => Username, folder name, or admin username for provider actions.
+                    <span class="shortcut"><b>{{`{{Name}}`}}</b></span> => Username, folder name, admin username for provider events, domain name for certificate events.
                 </p>
                 <p>
                     <span class="shortcut"><b>{{`{{Event}}`}}</b></span> => Event name, for example "upload", "download" for filesystem events or "add", "update" for provider events.

templates/webadmin/eventrule.html

@@ -545,6 +545,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
                 break;
             case '4':
             case 4:
+            case '5':
+            case 5:
                 break;
             default:
                 console.log(`unsupported event trigger type: ${val}`);