fix build in docker

html/schema.sql

@@ -3,6 +3,7 @@ CREATE TABLE IF NOT EXISTS `user` (
   `pubkey` text NOT NULL COMMENT 'armored gnupg public key of the user',
   PRIMARY KEY (`name`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='list of all registered users and their public keys';
+
 create table if not exists `message` (
         `id`
           int not null auto_increment
@@ -23,6 +24,8 @@ create table if not exists `message` (
           on update cascade
       ) character set utf8 engine=innodb
         comment="table to hold all messages for later download by the receiver";
+
+/* table to sore arbitrary options */
 create table if not exists options (
        name varchar(50) not null unique comment "option name",
        value text not null comment "option value",