feat: add externalIPs to proxy configuration

Author: holzman

jupyterhub/templates/proxy/service.yaml

@@ -81,3 +81,8 @@ spec:
     {{- . | toYaml | nindent 4 }}
   {{- end }}
   {{- end }}
+  {{- with .Values.proxy.service.externalIPs }}
+  externalIPs: {{- range . }}
+    - {{ . }}
+    {{- end }}
+  {{- end }}

jupyterhub/values.schema.yaml

@@ -1751,6 +1751,12 @@ properties:
               See [the Kubernetes
               documentation](https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.23/#serviceport-v1-core)
               for the structure of the items in this list.
+          externalIPs:
+            type: array
+            description: |
+              A list of external IP addresses (unmanaged by Kubernetes) for which
+              nodes in the cluster will accept traffic for this service.
+              See [externalIPs](https://kubernetes.io/docs/concepts/services-networking/service/#external-ips) for more details.
           loadBalancerIP:
             type: [string, "null"]
             description: |

jupyterhub/values.yaml

@@ -196,6 +196,7 @@ proxy:
       https:
     disableHttpPort: false
     extraPorts: []
+    externalIPs: []
     loadBalancerIP:
     loadBalancerSourceRanges: []
   # chp relates to the proxy pod, which is responsible for routing traffic based