AETHER-761 Add support of private image registry with auth enabled

Change-Id: I25e804570357c513bfd1822ab9d971c7ed1c5405
diff --git a/omec/omec-upf-pfcp-agent/values.yaml b/omec/omec-upf-pfcp-agent/values.yaml
index 1fd9f5e..1306965 100644
--- a/omec/omec-upf-pfcp-agent/values.yaml
+++ b/omec/omec-upf-pfcp-agent/values.yaml
@@ -7,6 +7,11 @@
     init: docker.io/omecproject/pod-init:1.0.0
     pfcpiface: docker.io/omecproject/upf-epc-pfcpiface:up4
   pullPolicy: Always
+  credentials: {}
+  # If specified, use this credential to access the image
+  #   registry:
+  #   username:
+  #   password:
 
 nodeSelectors:
   enabled: false