Allow for headless envoy services

[ryanhristovski]

When clusterip on service is set to None it causes a not critical error (everything still functions as expected):

envoy-gateway-65589cc498-8q4gl envoy-gateway 2025-06-02T20:10:54.589Z   ERROR   provider    kubernetes/status_updater.go:119    unable to update status {"runner": "provider", "name": "internal-gateway", "namespace": "infra-routing", "error": "Gateway.gateway.networking.k8s.io "internal-gateway" is invalid: [status: Invalid value: "": "addresses[0]" must validate one and only one schema (oneOf). Found none valid, status: Invalid value: "": "addresses[0].value" must validate at least one schema (anyOf), status.addresses[0].value: Invalid value: "None": addresses[0].value in body must be of type ipv4: "None", <nil>: Invalid value: "null": some validation rules were not checked because the object was invalid; correct the existing errors to complete validation]"}

Caused by this:

apiVersion: v1
kind: Service
metadata:
  name: envoy-headless
  namespace: <names
spec:
  type: ClusterIP
  clusterIP: None # This makes it a headless service
  ports:
    - name: http
      port: 80
      targetPort: 10080
      protocol: TCP
...

This solution simply adds valid cluster IP's, and ignores None or "".

Signed-off-by: Ryan Hristovski ryan.hristovski@docker.com

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.51%. Comparing base (a858b7b) to head (20275f0).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/status/gateway.go	57.14%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6250      +/-   ##
==========================================
+ Coverage   70.45%   70.51%   +0.05%     
==========================================
  Files         220      220              
  Lines       36607    36611       +4     
==========================================
+ Hits        25792    25815      +23     
+ Misses       9288     9270      -18     
+ Partials     1527     1526       -1     

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[arkodg]

thanks @ryanhristovski
can you add a test in https://github.com/envoyproxy/gateway/blob/main/internal/gatewayapi/status/gateway_test.go
as well as a comment, highlighting that the step skips adding None which represents headless services

[arkodg]

test is failing @ryanhristovski

[ryanhristovski]

/retest

[zirain]

/retest