Multiple certificates - regenerate array when renewing

[g105b]

Unit's listener/*:443/tls/certificate can take an array. It should always be an array if there are more than one domains served.

When certificate is renewed, get a local copy of the array, remove any entries that start with $app_name-certbot, then add the new $app_name-certbot-$date_stamp, then set the array back into Unit's configuration.

[g105b]

Documentation is lacking, but there's more information here:

https://unit.nginx.org/news/2021/unit-1.23.0-released/