func logEvent(log *logger.Logger, build models.Build, step string, err error) {
if err != nil {
log.Log("state=error step=build.%s app=%q build=%q error=%q", step, build.App, build.Id, err)
} else {
log.Success("step=build.%s app=%q build=%q", step, build.App, build.Id)
}
}
