Don't hardcode root when running lifecycle scripts

Continued from #1313

pkg/devcontainer/setup/lifecyclehooks.go

@@ -7,6 +7,7 @@ import (
 	"io"
 	"os"
 	"os/exec"
+	"os/user"
 	"regexp"
 	"slices"
 	"strings"
@@ -96,8 +97,12 @@ func run(commands []types.LifecycleHook, user, dir string, remoteEnv map[string]
 
 		for k, c := range cmd {
 			log.Infof("Run command %s: %s...", k, strings.Join(c, " "))
+			currentUser, err := user.Current()
+			if err != nil {
+				log.Fatalf("Error fetching the current user: %v", err)
+			}
 			args := []string{}
-			if user != "root" {
+			if user != currentUser {
 				args = append(args, "su", user, "-c", command.Quote(c))
 			} else {
 				args = append(args, "sh", "-c", command.Quote(c))