refactor: move Packer templates to top-level packer/ directory

packer/ubuntu-24.04/scripts/cleanup.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -eux
+
+pip uninstall -y ansible
+
+dnf clean all
+
+# Zero out the rest of the free space using dd, then delete the written file.
+#dd if=/dev/zero of=/EMPTY bs=1M
+#rm -f /EMPTY
+
+# Add `sync` so Packer doesn't quit too early, before the large file is deleted.
+sync