fix(helm): add restriction to prom metrics

this removes the cluster level configuration
it also adds in restrictions to prom metrics

Issue: https://coreosdev.atlassian.net/browse/QUAY-598

- [ ] It works!
- [ ] Comments provide sufficient explanations for the next contributor
- [ ] Tests cover changes and corner cases
- [ ] Follows Quay syntax patterns and format

helm/apostille-app/templates/apostille-ingress-prometheus.yaml

@@ -0,0 +1,22 @@
+kind: Ingress
+apiVersion: extensions/v1beta1
+metadata:
+  name: {{.Values.service}}
+  namespace: {{.Values.apostille_namespace}}
+  annotations:
+    kubernetes.io/tls-acme: "true"
+    kubernetes.io/ingress.class: "nginx"
+    ingress.kubernetes.io/whitelist-source-range: "207.251.72.138/32,50.250.250.40/29,195.226.171.114/32"
+spec:
+  tls:
+    - hosts:
+        - {{.Values.service_subdomain}}.quay.io
+      secretName: {{.Values.service}}-apostille-tls
+  rules:
+    - host: {{.Values.service_subdomain}}.quay.io
+      http:
+        paths:
+          - path: /metrics
+            backend:
+              serviceName: {{.Values.service}}
+              servicePort: 4443