public static InfraDeployerProvider from(Optional<InfraDeployer> infraDeployer) {
        return infraDeployer.map(InfraDeployerProvider::withInfraDeployer).orElseGet(InfraDeployerProvider::empty);
    }
Creates either an empty provider or a provider having the given infrastructure deployer
configserver/src/main/java/com/yahoo/vespa/config/server/deploy/InfraDeployerProvider.java