No netplan definition created for IPv6 only interfaces

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What steps did you take and what happened: I've added an additional interface to my machineTemplates. I've assigned an IPv6PoolRef to these. Netplan templating did not render this. Only after adding an IPv4PoolRef did the IPv6PoolRef render. As far as I can see, ipam did not assign an IP address, so the problem is probably in bootstrap.go. When the pool was rendered, metrics from IPv6 default routes were missing.

What did you expect to happen: IPv6PoolRef leads to netplan rendering. Metrics added via pool annotations work.

Anything else you would like to add: inb4 git blame myself: Git blame myself.

Environment:

• Cluster-api-provider-proxmox version: v0.7.0 621d61263920f4af71dc637f433981e680b2b831