Include mention of ZEEBE_BROKER_NETWORK_SECURITY_ options in openshift guide

[jessesimpson36]

The customer in the support ticket learned unexpectedly that our Zeebe Brokers need to have the TLS options configured, which was unintuitive to the customer because their expectation was that the zeebe gateway would be handling these sorts of network requests. Lets add a mention on the following documentation page

https://docs.camunda.io/docs/self-managed/setup/deploy/openshift/redhat-openshift/#configure-route-tls

and lets adjust the code-snippets here:
https://github.com/camunda/camunda-deployment-references/tree/main/aws/rosa-hcp/camunda-versions/8.6/procedure/install/helm-values

to include these extra environment variables necessary.

        - name: ZEEBE_BROKER_NETWORK_SECURITY_ENABLED
          value: "true"
        - name: ZEEBE_BROKER_NETWORK_SECURITY_CERTIFICATECHAINPATH
          value: "/usr/local/zeebe/config/tls.crt"
        - name: ZEEBE_BROKER_NETWORK_SECURITY_PRIVATEKEYPATH
          value: "/usr/local/zeebe/config/tls.key"

and necessary volumes+volumeMounts to support those settings.

SUPPORT-25911

[leiicamundi]

Hi @jessesimpson36

We have included it in https://github.com/camunda/camunda-deployment-references/blame/stable/8.6/generic/openshift/single-region/helm-values/zeebe-gateway-route.yml#L64

This will go live when #5142 is merged

[leiicamundi]

closed by #5142