Add DBUF helm chart

- Support the SR-IOV (Static IP first)

https://jira.opennetworking.org/browse/AETHER-803

- Fix docker image and dbuf args

Change-Id: I2942c6a7816c8a747203113d58576d677fc1da03
diff --git a/apps/dbuf/templates/secret-registry.yaml b/apps/dbuf/templates/secret-registry.yaml
new file mode 100644
index 0000000..eafb8e2
--- /dev/null
+++ b/apps/dbuf/templates/secret-registry.yaml
@@ -0,0 +1,18 @@
+{{/*
+# Copyright 2020-present Open Networking Foundation
+
+# SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
+*/}}
+
+{{- if .Values.image.credentials }}
+---
+kind: Secret
+apiVersion: v1
+metadata:
+  name: {{ .Release.Name }}.registry
+  labels:
+    release: {{ .Release.Name }}
+type: kubernetes.io/dockerconfigjson
+data:
+  .dockerconfigjson: {{ printf `{"auths":{%s:{"auth":"%s"}}}` (.Values.images.credentials.registry | quote) (printf "%s:%s" .Values.images.credentials.username .Values.images.credentials.password | b64enc) | b64enc | quote }}
+{{- end }}