Strict clusterIssuer also for cyberchef and urlaubsverwaltung

Per the maintainer decision (option a: ingress.clusterIssuer strictly
required in ALL charts) the two remaining defaults are removed as well:

- cyberchef: drop the letsencrypt default; bump raised from minor to
  major (6.0.0+up11.4.0) as this is a breaking values change.
- urlaubsverwaltung: drop the letsencrypt-issuer default; major bump
  to 6.0.0+up6.7.0.
- CI test-values for both charts now set clusterIssuer explicitly.

A repo-wide grep confirms no chart carries a clusterIssuer default
anymore.

ci/cyberchef/test-values.yaml

@@ -1,5 +1,6 @@
-# cyberchef: stateless, no secrets. Only the ingress host is required
-# (clusterIssuer already has a default). The Ingress just has to apply -
-# there is no ingress-nginx/cert-manager in the CI cluster.
+# cyberchef: stateless, no secrets. Only the required ingress values are set.
+# The Ingress just has to apply - there is no ingress-nginx/cert-manager in
+# the CI cluster.
 ingress:
   domain: cyberchef.ci.local
+  clusterIssuer: ci

ci/urlaubsverwaltung/test-values.yaml

@@ -4,3 +4,6 @@ secrets:
 
 ingress:
   domain: uv.ci.local
+  # clusterIssuer is strictly required (no default); the Ingress just has to
+  # apply - there is no cert-manager in the CI cluster.
+  clusterIssuer: ci

cyberchef/Chart.yaml

@@ -5,7 +5,7 @@ icon: https://raw.githubusercontent.com/gchq/CyberChef/master/src/web/static/ima
 
 type: application
 
-version: 5.2.0+up11.4.0
+version: 6.0.0+up11.4.0
 appVersion: "11.4.0"
 
 maintainers:

cyberchef/values.yaml

@@ -60,7 +60,7 @@ cyberchef:
 
 ingress:
   enabled: true
-  clusterIssuer: letsencrypt
+  clusterIssuer: null
   domain: null
   className: nginx
   # Extra annotations for the Ingress; merged with the cert-manager

urlaubsverwaltung/Chart.yaml

@@ -4,5 +4,5 @@ description: A Helm chart to deploy urlaubsverwaltung on Kubernetes
 icon: https://raw.githubusercontent.com/urlaubsverwaltung/urlaubsverwaltung/main/src/main/resources/static/favicons/apple-touch-icon.png
 type: application
 
-version: 5.0.0+up6.7.0
+version: 6.0.0+up6.7.0
 appVersion: 6.7.0

urlaubsverwaltung/values.yaml

@@ -10,7 +10,7 @@ secrets:
 
 ingress:
   enabled: true
-  clusterIssuer: "letsencrypt-issuer"
+  clusterIssuer: null
   domain: null
   className: nginx
   # Extra annotations for the Ingress; merged with the cert-manager