feat(node-features): Add node feature discovery

This patch adds NFD (Node Feature Discovery) which will provide various
additional labels on the nodes to use them for better node selector
statements. This should help to future-proof the setup.

References:
https://kubernetes-sigs.github.io/node-feature-discovery/v0.10/get-started/introduction.html

infrastructure/kustomization.yaml

@@ -8,3 +8,4 @@ resources:
   - cert-manager
   - prometheus
   - ingress-nginx
+  - node-features

infrastructure/node-features/kustomization.yaml

+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: node-features-system
+resources:
+  - namespace.yaml
+  - repository.yaml
+  - release.yaml

infrastructure/node-features/namespace.yaml

+apiVersion: v1
+kind: Namespace
+metadata:
+  name: node-features-system
+  labels:
+    name: node-features-system
+    kyverno.shivering-isles.com/class: "system"

infrastructure/node-features/release.yaml

+apiVersion: helm.toolkit.fluxcd.io/v2beta1
+kind: HelmRelease
+metadata:
+  name: node-feature-discovery
+  namespace: node-features-system
+spec:
+  releaseName: node-feature-discovery
+  chart:
+    spec:
+      chart: node-feature-discovery
+      sourceRef:
+        kind: HelmRepository
+        name: node-feature-discovery
+      version: 0.10.0
+  interval: 5m
+  values:
+    tls:
+      enable: true
+      certManager: true
+  install:
+    crds: CreateReplace
+  upgrade:
+    crds: CreateReplace

infrastructure/node-features/repository.yaml

+apiVersion: source.toolkit.fluxcd.io/v1beta1
+kind: HelmRepository
+metadata:
+  name: node-feature-discovery
+spec:
+  interval: 30m
+  url: https://kubernetes-sigs.github.io/node-feature-discovery/charts