Add linux/arm64 extended to release setup

Fixes #8257

release-hook-post-linux.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Se https://github.com/gohugoio/hugo/issues/8955
+objdump -T dist/hugo_extended_linux_linux_amd64/hugo | grep -E -q 'GLIBC_2.2[0-9]'
+RESULT=$?
+if [ $RESULT -eq 0 ]; then
+    echo "Found  GLIBC_2.2x in Linux binary, this will not work in older Vercel/Netlify images.";
+    exit -1;
+fi