foreach does not work

[Saint Michael]

The question is, how do I use the foreach construct  in the nginx
configuration file?

> I am using openresty
> nginx -version
> nginx version: openresty/1.21.4.1
> This fails:
>
>
>
>>  foreach $domain in $server_name {
>>>
>>         ssl_certificate /etc/letsencrypt/live/$domain/fullchain.pem;
>>         ssl_certificate_key /etc/letsencrypt/live/$domain/privkey.pem;
>>     }
>>
>
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