Attempt native imagebuilder image

REMOVED/hack/image-grok-latest-flatcar-version.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -ue
+
+[[ -n ${DEBUG:-} ]] && set -o xtrace
+
+channel="$1"
+
+curl -L -s \
+     "https://www.flatcar.org/releases-json/releases-$channel.json" \
+    | jq -r 'to_entries[] | "\(.key)"' \
+    | grep -v "current" \
+    | sort --version-sort \
+    | tail -n1