update nginx example to work multi-arch

Signed-off-by: Patrick Lang <patrick.lang@hotmail.com>

docs/examples/nginx/templates/post-install-job.yaml

@@ -32,6 +32,6 @@ spec:
       restartPolicy: {{ .Values.restartPolicy }}
       containers:
         - name: post-install-job
-          image: "alpine:3.3"
+          image: "alpine:latest"
           # All we're going to do is sleep for a while, then exit.
           command: ["/bin/sleep", "{{ .Values.sleepyTime }}"]

docs/examples/nginx/values.yaml

@@ -14,7 +14,7 @@ index: >-
 
 image:
   repository: nginx
-  tag: 1.11.0
+  tag: alpine
   pullPolicy: IfNotPresent
 
 service: