[stable/joomla] Use global registry in secondary and/or metrics images (#12251)

Signed-off-by: Carlos Rodriguez Hernandez <crhernandez@bitnami.com>

stable/joomla/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: joomla
-version: 4.1.1
+version: 4.2.0
 appVersion: 3.9.4
 description: PHP content management system (CMS) for publishing web content
 keywords:

stable/joomla/templates/_helpers.tpl

@@ -56,11 +56,24 @@ We truncate at 63 chars because some Kubernetes name fields are limited to this
 {{/*
 Return the proper image name (for the metrics image)
 */}}
-{{- define "metrics.image" -}}
-{{- $registryName :=  .Values.metrics.image.registry -}}
+{{- define "joomla.metrics.image" -}}
+{{- $registryName := .Values.metrics.image.registry -}}
 {{- $repositoryName := .Values.metrics.image.repository -}}
 {{- $tag := .Values.metrics.image.tag | toString -}}
-{{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
+{{/*
+Helm 2.11 supports the assignment of a value to a variable defined in a different scope,
+but Helm 2.9 and 2.10 doesn't support it, so we need to implement this if-else logic.
+Also, we can't use a single if because lazy evaluation is not an option
+*/}}
+{{- if .Values.global }}
+    {{- if .Values.global.imageRegistry }}
+        {{- printf "%s/%s:%s" .Values.global.imageRegistry $repositoryName $tag -}}
+    {{- else -}}
+        {{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
+    {{- end -}}
+{{- else -}}
+    {{- printf "%s/%s:%s" $registryName $repositoryName $tag -}}
+{{- end -}}
 {{- end -}}
 
 {{/*

stable/joomla/templates/deployment.yaml

@@ -139,7 +139,7 @@ spec:
           mountPath: /bitnami/apache
 {{- if .Values.metrics.enabled }}
       - name: metrics
-        image: {{ template "metrics.image" . }}
+        image: {{ template "joomla.metrics.image" . }}
         imagePullPolicy: {{ .Values.metrics.image.pullPolicy | quote }}
         command: [ '/bin/apache_exporter', '-scrape_uri', 'http://status.localhost:80/server-status/?auto']
         ports: