Added the helm hook for create user job for exporter

exporter-jpb-create-user was failing due to the field immutability
which was resulting in the manual delete of the job for every helm
upgrade to be successful. Reason being job being upgraded before the
other manifest that are required been updated. It can be avoided by
using helm-hook post-install and post-upgrade which will force the
job manifest to be applied only after all other manifest are applied.
Hook annotation is provided "5" so that the if other jobs are annotated,
exporter job will be last to created.
helm3_hook value is used for the condition which will enable the disable
of the hook.

Change-Id: I2039abb5bad07a19fd09fc5e245485c3c772beca

mariadb/Chart.yaml

@@ -15,7 +15,7 @@ apiVersion: v1
 appVersion: v10.2.31
 description: OpenStack-Helm MariaDB
 name: mariadb
-version: 0.2.4
+version: 0.2.5
 home: https://mariadb.com/kb/en/
 icon: http://badges.mariadb.org/mariadb-badge-180x60.png
 sources:

mariadb/templates/monitoring/prometheus/exporter-job-create-user.yaml

@@ -22,6 +22,12 @@ apiVersion: batch/v1
 kind: Job
 metadata:
   name: exporter-create-sql-user
+{{- if .Values.helm3_hook }}
+  annotations:
+    "helm.sh/hook": "post-install,post-upgrade"
+    "helm.sh/hook-weight": "5"
+    "helm.sh/hook-delete-policy": "before-hook-creation"
+{{- end }}
 spec:
   backoffLimit: {{ .Values.jobs.exporter_create_sql_user.backoffLimit }}
   template:

mariadb/values.yaml

@@ -619,6 +619,10 @@ network_policy:
     egress:
       - {}
 
+# Helm hook breaks for helm2.
+# Set helm3_hook: false in case helm2 is used.
+helm3_hook: true
+
 manifests:
   certificates: false
   configmap_bin: true

releasenotes/notes/mariadb.yaml

@@ -20,4 +20,5 @@ mariadb:
   - 0.2.2 remove deprecated svc annotation tolerate-unready-endpoints
   - 0.2.3 Remove panko residue
   - 0.2.4 Use full image ref for docker official images
+  - 0.2.5 Added helm hook for post-install and post-upgrade in prometheus exporter job.
 ...