private boolean allowBuildToFail(Instant now, List<MODELRESULT> built) {
        return ! built.isEmpty() &&
                (built.get(0).getModel().skipOldConfigModels(now) || zone().environment().isManuallyDeployed());
    }
Allow build of other config models to fail if there is a validation override that allow skipping old
config models, or we're manually deploying
configserver/src/main/java/com/yahoo/vespa/config/server/modelfactory/ModelsBuilder.java