CDK stack to handle GitHub pages

The following CDK stack configuration is required to configure AWS DNS servers in order to resolve an static site on GitHub Pages:

import * as cdk from 'aws-cdk-lib';
import { Construct } from 'constructs';
import * as route53 from 'aws-cdk-lib/aws-route53';


export const domainName = 'my.custom.domain';
export const gitHubIPs = [
  '185.199.108.153',
  '185.199.109.153',
  '185.199.110.153',
  '185.199.111.153',
]

export class WebStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const zone = new route53.PublicHostedZone(this, 'web-hosted-zone', {
      zoneName: domainName,
    });

    new cdk.CfnOutput(this, 'hosted-zone-id', {
      description: 'HostedZoneId',
      value: zone.hostedZoneId,
    });
    
    new route53.CnameRecord(this, 'cname-record', {
      zone: zone,
      recordName: 'www',
      domainName: String(process.env.GITHUB_PAGES_DOMAIN),  # it should be like <username>.github.io
    });

    new route53.ARecord(this, 'a-record', {
       zone: zone,
       recordName: domainName,
       target: route53.RecordTarget.fromIpAddresses(...gitHubIPs),
     });

    new cdk.CfnOutput(this, 'ns-servers', {
      description: 'NSServers',
      value: cdk.Fn.join(',', zone.hostedZoneNameServers || []),
    });
  }
}