CAAIdentities should be array of string and is read from configuration

[peponeska]

CAAIdentities should be array of string

CAAIdentities is read from configuration i.e. appsettings.json

[peponeska]

According to RFC 8555 caaIdentities should be an array of string

caaIdentities (optional, array of string): The hostnames that the
ACME server recognizes as referring to itself for the purposes of
CAA record validation as defined in [RFC6844]. Each string MUST
represent the same sequence of ASCII code points that the server
will expect to see as the "Issuer Domain Name" in a CAA issue or
issuewild property tag. This allows clients to determine the
correct issuer domain name to use when configuring CAA records.

Also, it could be read from appsettings https://github.com/jjrdk/opencertserver/blob/master/src/opencertserver.acme.server/Endpoints/DirectoryEndpoints.cs#L38