fix: version print of build script [skip ci]

build.sh

@@ -12,7 +12,8 @@ else
   webVersion=$(wget -qO- -t1 -T2 "https://api.github.com/repos/alist-org/alist-web/releases/latest" | grep "tag_name" | head -n 1 | awk -F ":" '{print $2}' | sed 's/\"//g;s/,//g;s/ //g')
 fi
 
-echo "build version: $gitTag"
+echo "backend version: $version"
+echo "frontend version: $webVersion"
 
 ldflags="\
 -w -s \