Prometheus: Fix permisions for PVC

This PS fixes the permisions for the PVC backing Prometheus

Change-Id: I19b96296fe3553df5b433c22c05cbdfff1b8402a

prometheus/templates/statefulset.yaml

@@ -51,6 +51,19 @@ spec:
       terminationGracePeriodSeconds: {{ .Values.pod.lifecycle.termination_grace_period.prometheus.timeout | default "30" }}
       initContainers:
 {{ tuple $envAll .Values.pod_dependency list | include "helm-toolkit.snippets.kubernetes_entrypoint_init_container" | indent 8 }}
+        - name: prometheus-perms
+{{ tuple $envAll "prometheus" | include "helm-toolkit.snippets.image" | indent 10 }}
+          securityContext:
+            runAsUser: 0
+{{ tuple $envAll $envAll.Values.pod.resources.prometheus | include "helm-toolkit.snippets.kubernetes_resources" | indent 10 }}
+          command:
+            - chown
+            - -R
+            - "nobody:"
+            - /var/lib/prometheus/data
+          volumeMounts:
+            - name: storage
+              mountPath: /var/lib/prometheus/data
       containers:
         - name: prometheus
 {{ tuple $envAll "prometheus" | include "helm-toolkit.snippets.image" | indent 10 }}