The next step is to configure your DNS provider to point to the domain of your
master environment on Platform.sh.
You can access the CNAME target from your terminal by using the CLI and the command
platform environment:info edge_hostname
Add a CNAME record from your desired domain to the value of the
edge_hostname. Depending on your registrar, this value may be called an "Alias" or something similar.
If your application is going to serve multiple domains, you will need to add a CNAME record for each of them.
You can find out more information about using an apex domain and CNAME records in the Going Live documentation.
Depending on your registrar and the TTL you set for the domain, it may take up to 72 hours for the DNS change to fully propagate across the Internet.