Add helper function for postgres name

test/nextcloud/1.1.0/templates/_postgres.tpl

@@ -13,6 +13,10 @@ app.kubernetes.io/name: {{ include "nextcloud.name" . }}-postgres
 app.kubernetes.io/instance: {{ .Release.Name }}-postgres
 {{- end }}
 
+{{- define "postgres.imageName" -}}
+{{- print "postgres:13.1" -}}
+{{- end -}}
+
 {{/*
 Retrieve postgres backup name
 This will return a unique name based on revision and chart numbers specified.

test/nextcloud/1.1.0/templates/backup-postgres-hook.yaml

@@ -17,7 +17,7 @@ spec:
       serviceAccountName: "{{ template "nextcloud.serviceAccountName" . }}"
       containers:
       - name: {{ .Chart.Name }}-postgres-backup
-        image: "postgres:13.1"
+        image: {{ template "postgres.imageName" . }}
         imagePullPolicy: {{ .Values.image.pullPolicy }}
         env:
         - name: POSTGRES_USER

test/nextcloud/1.1.0/templates/deployment.yaml

@@ -38,7 +38,7 @@ spec:
       {{- end }}
       initContainers:
         - name: init-postgresdb
-          image: "postgres:13.1"
+          image: {{ template "postgres.imageName" . }}
           command: ['sh', '-c', "until pg_isready -h {{ template "nextcloud.fullname" . }}-postgres; do echo waiting for postgres; sleep 2; done"]
           imagePullPolicy: {{ .Values.image.pullPolicy }}
       containers:

test/nextcloud/1.1.0/templates/postgres-deployment.yaml

@@ -25,7 +25,7 @@ spec:
     spec:
       containers:
       - name: {{ .Chart.Name }}-postgres
-        image: "postgres:13.1"
+        image: {{ template "postgres.imageName" . }}
         imagePullPolicy: {{ .Values.image.pullPolicy }}
         env:
         - name: POSTGRES_USER