Removed s390x, linux/arm platform as docker build was crashing (#8121)

Co-authored-by: Carlos Tadeu Panato Junior <ctadeu@gmail.com>

docs/examples/customization/external-auth-headers/deploy/auth-service.yaml

@@ -1,44 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: demo-auth-service
-  labels:
-    k8s-app: demo-auth-service
-  namespace: default
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      k8s-app: demo-auth-service
-  template:
-    metadata:
-      labels:
-        k8s-app: demo-auth-service
-    spec:
-      terminationGracePeriodSeconds: 60
-      containers:
-      - name: auth-service
-        image: electroma/ingress-demo-authsvc-amd64:0.1
-        ports:
-        - containerPort: 8080
-        resources:
-          limits:
-            cpu: 10m
-            memory: 20Mi
-          requests:
-            cpu: 10m
-            memory: 20Mi
----
-apiVersion: v1
-kind: Service
-metadata:
-  name: demo-auth-service
-  labels:
-    k8s-app: demo-auth-service
-  namespace: default
-spec:
-  ports:
-  - port: 80
-    targetPort: 8080
-  selector:
-    k8s-app: demo-auth-service