caddy-frontend: Implement ssl_ca_crt and apache-ca-certificate
ssl_ca_crt is implemented by automatically appending it to ssl_crt.
apache-ca-certificate is kept unimplemented, but explained how workaround it.
ssl_ca_crt is implemented by automatically appending it to ssl_crt.
apache-ca-certificate is kept unimplemented, but explained how workaround it.