Copy letsencrypt keys if available

src/freedombone-utils-setup

             MY_GPG_PUBLIC_KEY=$USB_MOUNT/public_key.gpg
         fi
 
+        if [ -f $USB_MOUNT/letsencrypt ]; then
+            echo $'Copying letsencrypt keys"'
+            cp -r $USB_MOUNT/letsencrypt /etc
+        fi
+
         if [ -d $USB_MOUNT/.ssh ]; then
             echo $'Importing ssh keys'
             cp -r $USB_MOUNT/.ssh /home/$MY_USERNAME