helm: Allow the use of existing policy configMap (#1376)

* Allow the use of existing policy configMap.

* Update charts/descheduler/templates/configmap.yaml

Co-authored-by: Amir Alavi <amiralavi7@gmail.com>

* Remove references to unused variable and update documentation regarding deschedulerPolicy

* Add missing newLine at EOF

* Update charts/descheduler/values.yaml

* remove trailing space

---------

Co-authored-by: Amir Alavi <amiralavi7@gmail.com>

charts/descheduler/templates/configmap.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.deschedulerPolicy }}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -10,3 +11,4 @@ data:
     apiVersion: "{{ .Values.deschedulerPolicyAPIVersion }}"
     kind: "DeschedulerPolicy"
 {{ toYaml .Values.deschedulerPolicy | trim | indent 4 }}
+{{- end }}

charts/descheduler/values.yaml

@@ -81,6 +81,10 @@ cmdOptions:
 # Recommended to use the latest Policy API version supported by the Descheduler app version
 deschedulerPolicyAPIVersion: "descheduler/v1alpha2"
 
+# deschedulerPolicy contains the policies the descheduler will execute.
+# To use policies stored in an existing configMap use:
+# NOTE: The name of the cm should comply to {{ template "descheduler.fullname" . }}
+# deschedulerPolicy: {}
 deschedulerPolicy:
   # nodeSelector: "key1=value1,key2=value2"
   # maxNoOfPodsToEvictPerNode: 10