Install arch appropriate build if the 'arch' command is present

hack/install_kustomize.sh

@@ -95,13 +95,17 @@ trap cleanup EXIT ERR
 pushd "$tmpDir" >& /dev/null
 
 opsys=windows
-arch=amd64
 if [[ "$OSTYPE" == linux* ]]; then
   opsys=linux
 elif [[ "$OSTYPE" == darwin* ]]; then
   opsys=darwin
 fi
 
+arch=amd64
+if command -v arch &> /dev/null; then
+  arch=$(arch)
+fi
+
 releases=$(curl -s $release_url)
 
 if [[ $releases == *"API rate limit exceeded"* ]]; then