I am very new to Kubernetes and I setup Kubernetes Registry addons just copy and pasting the yaml from Kubernetes Registry Addon just a small change in ReplicationController with emptyDir

apiVersion: v1
kind: ReplicationController
metadata:
  name: kube-registry-v0
  namespace: kube-system
  labels:
    k8s-app: kube-registry-upstream
    version: v0
    kubernetes.io/cluster-service: "true"
spec:
  replicas: 1
  selector:
    k8s-app: kube-registry-upstream
    version: v0
  template:
    metadata:
      labels:
        k8s-app: kube-registry-upstream
        version: v0
        kubernetes.io/cluster-service: "true"
    spec:
      containers:
      - name: registry
        image: registry:2
        resources:
          limits:
            cpu: 100m
            memory: 100Mi
        env:
        - name: REGISTRY_HTTP_ADDR
          value: :5000
        - name: REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY
          value: /var/lib/registry
        volumeMounts:
        - name: image-store
          mountPath: /var/lib/registry
        ports:
        - containerPort: 5000
          name: registry
          protocol: TCP
      volumes:
       - name: image-store
         emptyDir: {}

Then I forward the 5000 port as follows

$POD=$(kubectl get pods --namespace kube-system -l k8s-app=kube-registry-upstream \
            -o template --template '{{range .items}}{{.metadata.name}} {{.status.phase}}{{"\n"}}{{end}}' \
            | grep Running | head -1 | cut -f1 -d' ')


$kubectl port-forward --namespace kube-system $POD 5000:5000 &

I can push my images fine as follows

$docker tag alpine localhost:5000/nurrony/alpine
$docker push localhost:5000/nurrony/alpine

Then I write a Pod to test it like below

Version: v1
kind: Pod
metadata:
  name: registry-demo
  labels:
    purpose: registry-demo
spec:
  containers:
    - name: registry-demo-container
      image: localhost:5000/nurrony/alpine
      command: ["printenv"]
      args: ["HOSTNAME", "KUBERNETES_PORT"]
      env:
      - name: MESSAGE
        value: "hello world"
      command: ["/bin/echo"]
      args: ["$(MESSAGE)"]

It is throwing an error

Failed to pull image "localhost:5000/nurrony/alpine": image pull failed for localhost:5000/nurrony/alpine:latest, this may be because there are no credentials on this request. details: (net/http: request canceled)

Any idea why is this happening? Thanks in advance.