feat(platform): support non-Talos Kubernetes deployments

[lexfrei]

Summary

Cozystack currently cannot be deployed on non-Talos Kubernetes clusters (kubeadm, k3s, RKE2) because Talos-specific configurations are hardcoded in multiple components.

Problem

Several components assume Talos Linux features:

1. Cilium (packages/system/cilium/values-talos.yaml)

Hardcoded in packages/core/platform/sources/networking.yaml:

valuesFiles:
- values.yaml
- values-talos.yaml   # Always applied

Contains:

cilium:
  k8sServiceHost: localhost
  k8sServicePort: 7445   # Talos KubePrism
  cgroup:
    autoMount:
      enabled: false     # Talos mounts cgroups

2. Cozystack Operator (packages/core/installer/templates/cozystack-operator.yaml)

env:
- name: KUBERNETES_SERVICE_HOST
  value: localhost
- name: KUBERNETES_SERVICE_PORT
  value: "7445"

3. Linstor (packages/system/linstor/templates/satellites-talos.yaml)

LinstorSatelliteConfiguration cozystack-talos removes DRBD module loading init containers (Talos uses system extensions).

4. Kilo (packages/system/kilo/templates/configmap.yaml)

server: https://127.0.0.1:7445

5. GPU Operator (packages/core/platform/sources/gpu-operator.yaml)

Uses values-talos.yaml with driver.enabled: false.

Why ConfigMap Override Doesn't Work

In v0.30.6, users reported values-cilium in ConfigMap doesn't work on k3s/RKE2 (#973).

Root cause: valuesFiles are merged at artifact build time in packagesource_reconciler.go. Package spec.components[].values CAN override, but bundles/system.yaml only passes KubeOVN values — not Cilium values.

Proposed Solution

Option A: Add networking.apiServer to Platform values (Recommended)

Add to packages/core/platform/values.yaml:

networking:
  apiServer:
    host: "localhost"    # default for Talos KubePrism
    port: "7445"

Template in bundles/system.yaml:

{{- $ciliumValues := dict "cilium" (dict
  "k8sServiceHost" .Values.networking.apiServer.host
  "k8sServicePort" .Values.networking.apiServer.port) -}}
{{- $_ := set $networkingComponents "cilium" (dict "values" $ciliumValues) -}}

Non-Talos users override:

networking:
  apiServer:
    host: "10.0.0.1"
    port: "6443"

Option B: Add generic variants

Add cilium-generic, gpu-operator-generic variants without values-talos.yaml.

Additional Changes

• Make KUBERNETES_SERVICE_HOST/PORT in cozystack-operator.yaml configurable
• Conditional LinstorSatelliteConfiguration cozystack-talos creation
• Template Kilo kubeconfig server URL

Use Cases

• Running Cozystack on existing kubeadm clusters
• Running Cozystack on k3s/RKE2 where Talos is not an option
• Testing Cozystack in kind/minikube for development

Related

• Example: deploy Cozystack on top of plain Ubuntu using kubeadm #973: Community kubeadm deployment example (v0.30.6)