fix: style in build.sh

build.sh

@@ -77,11 +77,10 @@ function generate_checksum() {
 function spinner() {
     local pid=$1
     local delay=0.1
-    local spinstr='|/-\'
+    local spinstr="|/-\\"
     tput civis  # Hide the cursor
     printf "\r[%c] " " "
-    # shellcheck disable=SC2143
-    while [ "$(ps a | awk '{print $1}' | grep $pid)" ]; do
+    while kill -0 $pid 2>/dev/null; do
         local temp=${spinstr#?}
         printf "\r [%c]  " "$spinstr"
         local spinstr=$temp${spinstr%"$temp"}