correctly set the enr with custody subnet info

Author: g11tech

packages/cli/src/cmds/beacon/initPeerIdAndEnr.ts

@@ -7,6 +7,7 @@ import {Multiaddr} from "@multiformats/multiaddr";
 import {createPrivateKeyFromPeerId, SignableENR} from "@chainsafe/enr";
 import {Logger, fromHex} from "@lodestar/utils";
 import {ChainForkConfig} from "@lodestar/config";
+import {ssz} from "@lodestar/types";
 
 import {exportToJSON, readPeerId} from "../../config/index.js";
 import {writeFile600Perm} from "../../util/file.js";
@@ -69,7 +70,7 @@ function maybeUpdateEnr<T extends "ip" | "tcp" | "udp" | "ip6" | "tcp6" | "udp6"
 }
 
 export function overwriteEnrWithCliArgs(
-  _config: ChainForkConfig,
+  config: ChainForkConfig,
   enr: SignableENR,
   args: BeaconArgs,
   logger: Logger,
@@ -78,7 +79,6 @@ export function overwriteEnrWithCliArgs(
   const preSeq = enr.seq;
   const {port, discoveryPort, port6, discoveryPort6} = parseListenArgs(args);
   // TODO remove the hardcoding serialize count
-  (enr as unknown as {custody_subnet_count: string}).custody_subnet_count = "0x1000000000000000";
   maybeUpdateEnr(enr, "ip", args["enr.ip"] ?? enr.ip);
   maybeUpdateEnr(enr, "ip6", args["enr.ip6"] ?? enr.ip6);
   maybeUpdateEnr(enr, "udp", args["enr.udp"] ?? discoveryPort ?? enr.udp);
@@ -87,6 +87,7 @@ export function overwriteEnrWithCliArgs(
     maybeUpdateEnr(enr, "tcp", args["enr.tcp"] ?? port ?? enr.tcp);
     maybeUpdateEnr(enr, "tcp6", args["enr.tcp6"] ?? port6 ?? enr.tcp6);
   }
+  enr.set("custody_subnet_count", ssz.UintNum64.serialize(config.CUSTODY_REQUIREMENT));
 
   function testMultiaddrForLocal(mu: Multiaddr, ip4: boolean): void {
     const isLocal = isLocalMultiAddr(mu);