add template for ca issuer name and secret name

[gulecroc]

Motivation

To test geo-replication, I would like to install the pulsar chart 3 times :

• 1 for global zookeeper
• 2 for 2 pulsar clusters

I also would like to use TLS. The global zookeeper install will create the CA issuer and certificate, and the 2 pulsar clusters will use it to create their certificates.

Modifications

• add template to override CA issuer name and certificate secret name

Verifying this change

• Make sure that the change passes the CI checks.

[lhotari]

Thanks for the PR, @gulecroc . Please remove the geo-replication changes out of this PR since that will simplify handling of this PR so that we first get the TLS templating changes made.
We can handle the geo-replication examples in a separate PR.

I really appreciate your effort in making a Geo-replication example available directly in the Pulsar helm chart.
One minor detail is that global Zookeeper isn't required in Pulsar to use geo-replication. For completeness of the examples, it would be useful to then have examples of both cases. The Pulsar documentation doesn't clearly explain the different ways Pulsar geo-replication can be configured.

[gulecroc]

Hi @lhotari,

I remove the geo-replication doc.
I don't think it's necessarry to add .Values.certs.internal_issuer.type cases in the certs template because we could also set ca name and secretName values for selfsigning ?