Do not grant permissions on nodes/proxy by default (#329)

* Do not grant permissions on nodes/proxy by default

* Bump chart version to 2.5.6

Author: Farenjihn

charts/opencost/Chart.yaml

@@ -9,7 +9,7 @@ keywords:
 - finops
 - monitoring
 - opencost
-version: 2.5.5
+version: 2.5.6
 maintainers:
   - name: jessegoodier
   - name: toscott

charts/opencost/templates/clusterrole.yaml

@@ -12,7 +12,9 @@ rules:
       - configmaps
       - deployments
       - nodes
+      {{- if .Values.opencost.exporter.collectorDataSource.enabled }}
       - nodes/proxy
+      {{- end }}
       - pods
       - services
       - resourcequotas