Automate setting of backstage.global.clusterRouterBase

[dmartinol]

Can we replace the manual setting of backstage.global.clusterRouterBase with a lookup function?

oc get ingress.config.openshift.io/cluster -oyaml | yq '.spec.domain'

The lookup should be like:

{{- $cluster := lookup "config.openshift.io/v1" "Ingress" ".Values.global.rhsso.namespace" "cluster" }}
{{- $domain := "UNKNOWN" }}
{{- if hasKey $cluster "spec" }}
  {{- if hasKey $cluster.spec "domain" }}
    {{- $domain = $cluster.spec.domain}}
  {{- end }}
{{- end }}

[dmartinol]

@masayag

[masayag]

Adding a reference to the usage of the property:
https://github.com/janus-idp/helm-backstage/blob/a20e258fa478970baf4a1db2ac1e6bae1e3332de/charts/backstage/templates/_helpers.tpl#L7

[dmartinol]

I missed the fact that this is used in a dependant chart, and helm does not provide a way to override a template function.
so, assuming that Backstage deployers are already familiar with using this global flag, we can probably just accept this as is (or maybe create ab equivalent issue in the upstream project, so they can solve it instead)

[dmartinol]

Tracked new issue janus-idp/helm-backstage#167 to dependant chart