chore(postgresql): Enable chart-lint and chart-testing for charts/postgresql (#779)

Related: https://github.com/SigNoz/platform-pod/issues/1220

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chart Release**
  * PostgreSQL Helm chart version updated to 0.0.2

* **Configuration Updates**
  * Image registry and pull secrets handling refined
  * Storage class configuration logic streamlined
  * PostgreSQL chart added to automated testing validation

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

charts/postgresql/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 name: postgresql
-version: 0.0.1
+version: 0.0.2
 appVersion: 15.0.0
 description: A Helm Chart for PostgreSQL
 type: application

charts/postgresql/templates/_helpers.tpl

@@ -62,7 +62,7 @@ ServiceAccount name
 {{- end -}}
 
 {{- define "postgresql.imagePullSecrets" -}}
-{{- if or .Values.global.imagePullSecrets .Values.imagePullSecrets }}
+{{- if .Values.imagePullSecrets }}
 imagePullSecrets:
 {{- range .Values.global.imagePullSecrets }}
   - name: {{ . }}
@@ -77,7 +77,7 @@ imagePullSecrets:
 Return the proper signoz image name
 */}}
 {{- define "postgresql.image" -}}
-{{- $registryName := default .Values.image.registry .Values.global.imageRegistry -}}
+{{- $registryName := .Values.image.registry -}}
 {{- $repositoryName := .Values.image.repository -}}
 {{- $tag := default .Chart.AppVersion .Values.image.tag | toString -}}
 {{- if $registryName -}}

charts/postgresql/templates/statefulset.yaml

@@ -149,7 +149,7 @@ spec:
         resources:
           requests:
             storage: {{ .Values.persistence.size }}
-      {{- $storageClass := default .Values.persistence.storageClass .Values.global.storageClass -}}
+      {{- $storageClass := .Values.persistence.storageClass -}}
       {{- if $storageClass -}}
       {{- if (eq "-" $storageClass) }}
         storageClassName: ""

charts/postgresql/values.yaml

@@ -188,4 +188,4 @@ serviceAccount:
   annotations: {}
   # serviceAccount.name -- The name of the service account to use. If not set and `create` is true, a name is generated.
   # @default -- null
-  name:
+  name:

ct.yaml

@@ -6,6 +6,7 @@ charts:
   - charts/clickhouse
   - charts/k8s-infra
   - charts/signoz
+  - charts/postgresql
 check-version-increment: false
 helm-extra-args: --timeout 5m
 chart-repos: