refactor: improve HTTP client configuration in webhook server

Author: slm0n87

cmd/webhook/main.go

@@ -1,8 +1,10 @@
 package main
 
 import (
+	"net"
 	"net/http"
 	"os"
+	"time"
 
 	"github.com/cert-manager/cert-manager/pkg/acme/webhook/cmd"
 	"github.com/stackitcloud/stackit-cert-manager-webhook/internal/repository"
@@ -28,10 +30,24 @@ func main() {
 	// You can register multiple DNS provider implementations with a single
 	// webhook, where the Name() method will be used to disambiguate between
 	// the different implementations.
+
+	httpClient := &http.Client{
+		Timeout: 30 * time.Second,
+		Transport: &http.Transport{
+			DialContext: (&net.Dialer{
+				Timeout:   5 * time.Second,
+				KeepAlive: 30 * time.Second,
+			}).DialContext,
+			TLSHandshakeTimeout:   5 * time.Second,
+			ResponseHeaderTimeout: 10 * time.Second,
+			IdleConnTimeout:      30 * time.Second,
+		},
+	}
+
 	cmd.RunWebhookServer(
 		GroupName,
 		resolver.NewResolver(
-			&http.Client{},
+			httpClient,
 			logger,
 			repository.NewZoneRepositoryFactory(),
 			repository.NewRRSetRepositoryFactory(),