racecar_analytics add push to create functions

db.go

func CreateECU(ecu ECU) (ECU, error) {
	result := DB.Create(&ecu)
	if result.Error != nil {
		return ECU{}, result.Error
	}
	PushECU(ecu) // add this
	return ecu, nil
}

func CreateBattery(battery Battery) (Battery, error) {
	result := DB.Create(&battery)
	if result.Error != nil {
		return Battery{}, result.Error
	}
	PushBattery(battery) // add this
	return battery, nil
}