Configuration options for cluster-domain and kubernetes-endpoint in cozystack configmap. #168

We have to provide an extra options for cozystack configmap, which can be optional:

cluster-domain: cozy.local
kubernetes-endpoint: https://192.168.123.11:6443

If they are specified, we have to consume them by installer.sh instead of hardcoded values:
https://github.com/aenix-io/cozystack/blob/838bee5d25bbe65a48f01e1de610298a4beb91cf/manifests/cozystack-installer.yaml#L73-L76

and also pass them for fluxcd and clilium values.

details:

• Migrate from fluxcd-community charts to Flux-Operator #166 (comment)
• Unhardcode cluster.local domain controlplaneio-fluxcd/flux-operator#34 (comment)