new: [nextcloud] disable ``updatenotification`` and ``nextcloud_announcements`` app at first install

nextcloud/lib/common

@@ -76,6 +76,10 @@ get_admin_user_password() {
     fi
 }
 
+## only called after first install and occ is available
+nextcloud:init() {
+    occ app:disable updatenotification nextcloud_announcements
+}
 
 create_occ_if_not_exists() {
 
@@ -110,6 +114,7 @@ create_occ_if_not_exists() {
             err "Expected last command to create /var/www/html/occ"
             return 1
         fi
+        nextcloud:init
     fi
 }