feat: add ClusterClass support#32
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Adds CloudscaleClusterTemplate CRD (with defaulting/validation webhook sharing logic with CloudscaleCluster), a `quick-start` ClusterClass, and a `topology` flavor cluster template using said ClusterClass.
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Summary
CloudscaleClusterTemplateCRD + webhook (defaulting/validation shared withCloudscaleCluster, spec immutable on update).quick-startClusterClass with variables for region, credentials, control-plane/worker flavor/image/root volume size, and SSH keys.topologyflavor (cluster-template-topology.yaml) that produces aClusterreferencing the ClusterClass instead of inline infra/CP/MD resources.How to test
Check out this branch.
Apply the ClusterClass once per namespace:
$ clusterctl generate cluster quick-start \ --kubernetes-version v1.35.2 \ --from templates/cluster-class.yaml \ | kubectl apply -f -Generate and apply a topology-based cluster:
$ clusterctl generate cluster my-cluster \ --kubernetes-version v1.35.2 \ --control-plane-machine-count 1 \ --worker-machine-count 2 \ --from templates/cluster-template-topology.yaml \ | kubectl apply -f -Verify:
Scale workers via the topology (no direct MD edits):
kubectl patch cluster my-cluster --type=merge -p \ '{"spec":{"topology":{"workers":{"machineDeployments":[{"class":"worker","name":"md-0","replicas":3}]}}}}'Webhook checks:
CloudscaleClusterTemplatewith an invalid region → rejected.CloudscaleClusterTemplate.spec→ rejected as immutable.