fix: try all package managers for NGINX, clear error if all fail

internal/native/native.go

@@ -235,13 +235,36 @@ func CreateNodesDir() error {
 }
 
 // installNginx ensures NGINX is present on the system.
+// Tries apt, yum, dnf, apk — prints clear error if all fail.
 func installNginx() {
 	if _, err := exec.LookPath("nginx"); err == nil {
 		return
 	}
 	fmt.Println("Installing NGINX (required by Wallarm node)...")
-	exec.Command("apt-get", "update", "-qq").Run()
-	exec.Command("apt-get", "install", "-y", "-qq", "nginx").Run()
+
+	// Try common package managers
+	for _, pm := range [][]string{
+		{"apt-get", "update", "-qq"},
+		{"apt-get", "install", "-y", "-qq", "nginx"},
+		{"yum", "install", "-y", "-q", "nginx"},
+		{"dnf", "install", "-y", "-q", "nginx"},
+		{"apk", "add", "--no-cache", "nginx"},
+	} {
+		if _, err := exec.LookPath(pm[0]); err == nil {
+			cmd := exec.Command(pm[0], pm[1:]...)
+			if out, err := cmd.CombinedOutput(); err == nil {
+				fmt.Println("  Installed via", pm[0])
+				return
+			} else {
+				_ = out
+			}
+		}
+	}
+
+	// If all fail, print instructions
+	fmt.Println("Could not install NGINX automatically.")
+	fmt.Println("Install it manually: apt-get install nginx")
+	fmt.Println("Then re-run the deployment.")
 }
 
 // cloudFromHost maps API host to cloud region code (US/EU/ME).