@Override
    Optional<String> getCaCertificates(ConnectorConfig.Ssl sslConfig) {
        try {
            return Optional.of(Files.readString(dataplaneProxyCredentials.certificateFile(), StandardCharsets.UTF_8));
        } catch (IOException e) {
            throw new IllegalArgumentException("Dataplane proxy certificate not available", e);
        }
    }
Used to enable token based endpoints in Cloud. Amends trust store to allow proxy.

@author mortent
container-core/src/main/java/com/yahoo/jdisc/http/ssl/impl/CloudTokenSslContextProvider.java