fix concurrent write map issue in egctl (#6628)

Signed-off-by: zirain <[email protected]>

Author: zirain

internal/cmd/egctl/config.go

@@ -37,9 +37,8 @@ var (
 )
 
 const (
-	adminPort          = 19000   // TODO: make this configurable until EG support
-	rateLimitDebugPort = 6070    // TODO: make this configurable until EG support
-	containerName      = "envoy" // TODO: make this configurable until EG support
+	adminPort          = 19000 // TODO: make this configurable until EG support
+	rateLimitDebugPort = 6070  // TODO: make this configurable until EG support
 )
 
 type aggregatedConfigDump map[string]map[string]protoreflect.ProtoMessage
@@ -67,7 +66,8 @@ func retrieveConfigDump(args []string, includeEds bool, configType envoyConfigTy
 		return nil, err
 	}
 
-	podConfigDumps := make(aggregatedConfigDump, 0)
+	podConfigDumps := make(aggregatedConfigDump)
+	mu := sync.Mutex{}
 	// Initialize the map with namespaces
 	for _, pod := range pods {
 		if _, ok := podConfigDumps[pod.Namespace]; !ok {
@@ -99,7 +99,9 @@ func retrieveConfigDump(args []string, includeEds bool, configType envoyConfigTy
 				return
 			}
 
+			mu.Lock()
 			podConfigDumps[pod.Namespace][pod.Name] = configDump
+			mu.Unlock()
 		}()
 	}
 
@@ -167,7 +169,7 @@ func fetchRunningEnvoyPods(c kube.CLIClient, nn types.NamespacedName, labelSelec
 		pods = podList.Items
 	}
 
-	podsNamespacedNames := []types.NamespacedName{}
+	podsNamespacedNames := make([]types.NamespacedName, 0, len(pods))
 	for _, pod := range pods {
 		podNsName := utils.NamespacedName(&pod)
 		if pod.Status.Phase != "Running" {