Add support for CNI: Cilium

[Pionerd]

Problem description

Today Cilium is supported by SKE, but the only way to set it up during cluster creation is using (according to the docs) stackit ske cluster create -p <PROJECT_ID> <CLUSTER_NAME> --payload @cluster-configuration.json, even though my CLI version does not even yet expose the netword/CNI config value.

Proposed solution

Add support for a network_cni parameter: calico/cilium.

[philross]

I would also be interested in having this configurable via terraform.

[Fyusel]

Hi @Pionerd,
thank you for reporting this issue. We will have a look at it.