add cpu profiling

cmd/kubeconform/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"context"
 	"fmt"
+	"log"
 	"os"
+	"runtime/pprof"
 	"sync"
 
 	"github.com/yannh/kubeconform/pkg/config"
@@ -51,6 +53,18 @@ func realMain() int {
 		return 1
 	}
 
+	if cfg.CPUProfileFile != "" {
+		f, err := os.Create(cfg.CPUProfileFile)
+		if err != nil {
+			log.Fatal("could not create CPU profile: ", err)
+		}
+		defer f.Close()
+		if err := pprof.StartCPUProfile(f); err != nil {
+			log.Fatal("could not start CPU profile: ", err)
+		}
+		defer pprof.StopCPUProfile()
+	}
+
 	// Detect whether we have data being piped through stdin
 	stat, _ := os.Stdin.Stat()
 	isStdin := (stat.Mode() & os.ModeCharDevice) == 0