kustomize: add an example custom rules configmap

Add an example kustomize overlay for deploying a configmap specifying
extra rules for the custom feature source.

deployment/overlays/samples/custom-rules/custom-rules.example.yaml

@@ -0,0 +1,7 @@
+#- name: "more.kernel.features"
+#  matchOn:
+#  - loadedKMod: ["example_kmod3"]
+#- name: "more.features.by.nodename"
+#  value: customValue
+#  matchOn:
+#  - nodename: ["special-.*-node-.*"]

deployment/overlays/samples/custom-rules/kustomization.yaml

@@ -0,0 +1,18 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: node-feature-discovery
+
+resources:
+- ../../default
+
+configMapGenerator:
+- name: custom-source-extra-rules-1
+  files:
+  - custom.conf=custom-rules.example.yaml
+
+patches:
+- path: mounts.yaml
+  target:
+    labelSelector: app=nfd
+    name: nfd-worker

deployment/overlays/samples/custom-rules/mounts.yaml

@@ -0,0 +1,13 @@
+- op: add
+  path: /spec/template/spec/volumes/-
+  value:
+    name: custom-source-extra-rules-1
+    configMap:
+      name: custom-source-extra-rules-1
+
+- op: add
+  path: /spec/template/spec/containers/0/volumeMounts/-
+  value:
+    name: custom-source-extra-rules-1
+    mountPath: /etc/kubernetes/node-feature-discovery/custom.d/extra-rules-1
+    readOnly: true