TTL issues with default hcloud resolvers

[slauger]

The default resolvers from hcloud have a very strange caching mechanism and ignore the TTL from Cloudflare. A newly created record (e. g. api-int.cluster-id.basedomain.tld) is resolvable after about 60 minutes. This record is required for the inital boot of all master/worker nodes -> we need somehow override the dns servers provided by dhcp and switch to custom dns servers / cloudflare (during the first boot!)