support reading image pull secrets from globals (#340)

* support global image pull secrets for the deployment

Defaults to reading from global image pull secrets when no pull secrets are provided.

This makes it consistent when the image helper also reading from globals.

* add it to global values

Author: marwanad

chart/templates/replicated-deployment.yaml

@@ -26,7 +26,7 @@ spec:
         {{- include "replicated.podLabels" . | nindent 8 }}
         {{- end }}
     spec:
-      {{- with .Values.imagePullSecrets }}
+      {{- with .Values.imagePullSecrets | default .Values.global.imagePullSecrets }}
       imagePullSecrets:
         {{- toYaml . | nindent 8 }}
       {{- end }}

chart/values.yaml

@@ -5,6 +5,7 @@
 # Global settings shared across multiple charts
 global:
   imageRegistry: ""  # Optional registry override to use for all images
+  imagePullSecrets: [] # List of secrets containing docker registry credentials
 
 # Additional labels to add to all resources created by this chart
 # Useful for organizational or filtering purposes