Zipline chart: ingress standard, secret ref structure (conventions batch 3)

Repo-standard flexible ingress (required clusterIssuer instead of the
hardcoded letsencrypt-issuer, domain moved from config.domain to
ingress.domain, className value, annotations merge, standard TLS secret
name), secrets.<name>SecretRef structure, core secret renamed to the
standard -secret name, additive tpl-rendered env block, documented PVC
naming exception. Major bump 4.1.2+up4.7.0 -> 5.0.0+up4.7.0.

ci/zipline/fixtures.yaml

@@ -10,7 +10,7 @@ stringData:
 apiVersion: v1
 kind: Secret
 metadata:
-  name: ci-zipline-core-secret
+  name: ci-zipline-secret
 stringData:
   server-secret: zipline-ci-core-secret-0123456789abcdef0123456789abcdef0123456789
 ---