Configure a specific realm for application's gatekeeper

[filippomc]

Currently, the namespace is used as the primary and only option to define the realm.
There are occasions when we want/need to use a different realm coming from external keycloak instance

cloud-harness/deployment-configuration/helm/templates/auto-gatekeepers.yaml

Line 13 in 0a5af04

discovery-url: {{ ternary "https" "http" $tls}}://{{ .root.Values.apps.accounts.harness.subdomain }}.{{ .root.Values.domain }}/auth/realms/{{ .root.Values.namespace }}

So .root.Release.Namespace should be the default if .app.accounts_realm is not defined