feat: add global.images.pullPolicy support to k8s-agents-operator

Add support for cascading pullPolicy from global.images.pullPolicy setting:
- Added k8s-agents-operator.manager.imagePullPolicy helper in _helpers.tpl
- Updated deployment.yaml to use the helper instead of inline default

Configuration hierarchy:
1. global.images.pullPolicy (highest priority)
2. controllerManager.manager.image.pullPolicy
3. Default: IfNotPresent

Users can now configure pull policy globally:
global:
  images:
    pullPolicy: Always

Author: dpacheconr

charts/k8s-agents-operator/templates/_helpers.tpl

@@ -6,6 +6,18 @@ Returns if the template should render, it checks if the required values are set.
 {{- and (or $licenseKey)}}
 {{- end -}}
 
+{{- define "k8s-agents-operator.manager.imagePullPolicy" -}}
+{{- $globalPullPolicy := .Values.global.images.pullPolicy | default "" -}}
+{{- $chartPullPolicy := .Values.controllerManager.manager.image.pullPolicy | default "" -}}
+{{- if $globalPullPolicy -}}
+  {{- $globalPullPolicy -}}
+{{- else if $chartPullPolicy -}}
+  {{- $chartPullPolicy -}}
+{{- else -}}
+  IfNotPresent
+{{- end -}}
+{{- end -}}
+
 {{- define "k8s-agents-operator.manager.image" -}}
 {{- $managerRepository := .Values.controllerManager.manager.image.repository -}}
 {{- $defaultRepository := "newrelic/k8s-agents-operator" -}}

charts/k8s-agents-operator/templates/deployment.yaml

@@ -72,7 +72,7 @@ spec:
         - name: ENABLE_WEBHOOKS
           value: "true"
         image: {{ include "k8s-agents-operator.manager.image" . }}
-        imagePullPolicy: {{ .Values.controllerManager.manager.image.pullPolicy | default "Always" }}
+        imagePullPolicy: {{ include "k8s-agents-operator.manager.imagePullPolicy" . }}
         livenessProbe:
           httpGet:
             path: /healthz