metallb deployment fails in k3d-dev

When deploying metallb in k3d-dev the script fails

mkdir: cannot create directory ‘/tmp/metallb’: File exists

Once you move past this you get new errors:

• metallb deployment never succeeds, wait times out, but the script doesn't check the error
• metallb webhooks don't deploy
• metallb-config for -a mode fails because webhooks are missing

This appears to happen whether -a is present or not