Create a self-signed cert for the local domain if it doesn't exist

src/freedombone-utils-android

         detect_installable_apps
     fi
 
+    # Create a self-signed cert if needed
+    # The FreedomBox app assumes a self-signed cert
+    if [ ! -f "/etc/ssl/certs/${local_hostname}.crt" ]; then
+        install_web_local_user_interface
+    fi
+
     local_hostname=$(grep 'host-name' /etc/avahi/avahi-daemon.conf | awk -F '=' '{print $2}').local
     plinth_api="/var/www/${local_hostname}/htdocs/plinth/api/1"