message: fix(light_node): add missing clap cli arg definition for `--riker-threads` option
diff: @@ -587,6 +587,13 @@ pub fn tezos_app() -> App<'static, 'static> {
  .value_name("NUM")
  .help("Number of threads spawned by a tokio thread pool. If value is zero, then number of threads equal to CPU cores is spawned.")
  .validator(parse_validator_fn!(usize, "Value must be a valid number")))
  + .arg(Arg::with_name("riker-threads")
  + .long("riker-threads")
  + .global(true)
  + .takes_value(true)
  + .value_name("NUM")
  + .help("Number of threads spawned by a riker (actor system) thread pool. If value is zero, then number of threads equal to CPU cores is spawned.")
  + .validator(parse_validator_fn!(usize, "Value must be a valid number")))
  .arg(Arg::with_name("maindb-backend")
  .long("maindb-backend")
  .takes_value(true)
  