Add internal and external URL config for KAS

See https://gitlab.com/gitlab-org/gitlab/-/issues/299850

changelogs/unreleased/add-kas-api-url-config.yml

+---
+title: Add internal and external URL config for KAS
+merge_request: 54260
+author:
+type: added

config/gitlab.yml.example

@@ -1159,10 +1159,17 @@ production: &base
     # secret_file: /home/git/gitlab/.gitlab_workhorse_secret
 
   gitlab_kas:
+    # enabled: true
     # File that contains the secret key for verifying access for gitlab-kas.
     # Default is '.gitlab_kas_secret' relative to Rails.root (i.e. root of the GitLab app).
     # secret_file: /home/git/gitlab/.gitlab_kas_secret
 
+    # The URL to the external KAS API (used by the Kubernetes agents)
+    # external_url: wss://kas.example.com
+
+    # The URL to the internal KAS API (used by the GitLab backend)
+    # internal_url: grpc://localhost:8153
+
   ## GitLab Elasticsearch settings
   elasticsearch:
     indexer_path: /home/git/gitlab-elasticsearch-indexer/

config/initializers/1_settings.rb

@@ -710,7 +710,10 @@ Settings.workhorse['secret_file'] ||= Rails.root.join('.gitlab_workhorse_secret'
 # GitLab KAS
 #
 Settings['gitlab_kas'] ||= Settingslogic.new({})
+Settings.gitlab_kas['enabled'] ||= false
 Settings.gitlab_kas['secret_file'] ||= Rails.root.join('.gitlab_kas_secret')
+Settings.gitlab_kas['external_url'] ||= 'wss://kas.example.com'
+Settings.gitlab_kas['internal_url'] ||= 'grpc://localhost:8153'
 
 #
 # Repositories