fix: use timer replace the ticker for heathcheck (#116)

Fixed a potential timeout call that caused multiple health checks

main.go

@@ -313,17 +313,18 @@ func getHealthCheckURL(endpoint, healthCheckPath string, healthCheckPort int) (s
 
 // healthCheck - background routine which checks if a backend is up or down.
 func (b *Backend) healthCheck(ctxt context.Context) {
- ticker := time.NewTicker(b.healthCheckDuration)
- defer ticker.Stop()
+ timer := time.NewTimer(b.healthCheckDuration)
+ defer timer.Stop()
  for {
  select {
  case <-ctxt.Done():
  return
- case <-ticker.C:
+ case <-timer.C:
  err := b.doHealthCheck()
  if err != nil {
  console.Errorln(err)
  }
+ timer.Reset(b.healthCheckDuration)
  }
  }
 }