feat (molgenis-vault): Add backup cronjob

Needs to run under service account created by the etcd-operator subchart so there's some template magic needed to figure out what it's called.

molgenis-vault/templates/backup-cronjob.yaml

@@ -0,0 +1,30 @@
+{{- if .Values.backupJob.enable }}
+# cronjob that creates etcdbackups using the etcd backup serviceaccount
+apiVersion: batch/v1beta1
+kind: CronJob
+metadata:
+  name: etcd-backup
+spec:
+  schedule: {{ .Values.backupJob.schedule | quote }}
+  jobTemplate:
+    spec:
+      template:
+        spec:
+          serviceAccountName: {{ include "call-nested" (list . "etcd-operator" "etcd-operator.serviceAccountName") }}
+          containers:
+          - name: etcd-backup
+            image: lachlanevenson/k8s-kubectl
+            command:
+            - /bin/sh
+            - "-ec"
+            - |
+              sed -e "s|<NOW>|$(date '+%Y-%m-%d_%H:%M:%S')|g" /var/etcd_backup/backup_cr.yaml | kubectl create -f -
+            volumeMounts:
+            - name: backup-config
+              mountPath: /var/etcd_backup
+          restartPolicy: OnFailure
+          volumes:
+          - name: backup-config
+            configMap:
+              name: backup-config
+{{- end }}