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

Change-Id: I25e804570357c513bfd1822ab9d971c7ed1c5405
diff --git a/omec/omec-upf-cni/values.yaml b/omec/omec-upf-cni/values.yaml
index f9e1094..2008555 100644
--- a/omec/omec-upf-cni/values.yaml
+++ b/omec/omec-upf-cni/values.yaml
@@ -7,6 +7,11 @@
     omecCni: docker.io/omecproject/omec-cni:1.0.2
     sriovPlugin: docker.io/nfvpe/sriov-device-plugin:v3.2
   pullPolicy: IfNotPresent
+  credentials: {}
+  # If specified, use this credential to access the image
+  #   registry:
+  #   username:
+  #   password:
 
 config:
   sriov: