refactor: rewrite use bash to sh (#1)

scripts/install-xray.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Download Xray latest
 
@@ -15,7 +15,7 @@ fi
 
 check_if_running_as_root() {
     # If you want to run as another user, please modify $EUID to be owned by this user
-    if [[ "$EUID" -ne '0' ]]; then
+    if [[ "$(id -u)" -ne '0' ]]; then
         echo "error: You must run this script as root!"
         exit 1
     fi
@@ -86,7 +86,7 @@ download_xray() {
     else
         DOWNLOAD_LINK="https://github.com/$UPSTREAM_REPO/Xray-core/releases/download/$RELEASE_TAG/Xray-linux-$ARCH.zip"
     fi
-    
+
     echo "Downloading Xray archive: $DOWNLOAD_LINK"
     if ! curl -RL -H 'Cache-Control: no-cache' -o "$ZIP_FILE" "$DOWNLOAD_LINK"; then
         echo 'error: Download failed! Please check your network or try again.'