fix(valkey)!: migrate to valkey/valkey (#1097)

Migrate from bitnamicharts/valkey (and bitnamicharts/valkey-cluster) to the official Valkey Helm chart (https://valkey.io/valkey-helm, v0.10.0).

Changes:
- Remove valkey-cluster dependency and all related values, templates, and unit tests
- Update valkey dependency to use https://valkey.io/valkey-helm
- Adapt _helpers.tpl (valkey.dns, valkey.port, valkey.servicename) to the new chart's service naming and value structure
- Update values.yaml to match the new chart's configuration schema (auth.aclUsers instead of global.valkey.password, service.port instead of primary.service.ports.valkey, dataStorage instead of
  primary.persistence)
- Update all affected unit tests
- Update README documentation

BREAKING CHANGE: valkey-cluster support has been removed. Users previously relying on valkey-cluster must migrate to standalone valkey or an external Redis-compatible service. The valkey values structure
has changed: `valkey.global.valkey.password` is now `valkey.auth.aclUsers.default.password`, and `valkey.primary.service.ports.valkey` is now `valkey.service.port`.

---------

Co-authored-by: rishub <183523+rishub@noreply.gitea.com>
Co-authored-by: rishub <itsrishub@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/1097
Co-authored-by: Markus Pesch <markus.pesch@cryptic.systems>

unittests/helm/config/queue-config.yaml

@@ -3,26 +3,9 @@ release:
   name: gitea-unittests
   namespace: testing
 tests:
-  - it: "queue is configured correctly for valkey-cluster"
-    template: templates/gitea/config.yaml
-    set:
-      valkey-cluster:
-        enabled: true
-      valkey:
-        enabled: false
-    asserts:
-      - documentIndex: 0
-        equal:
-          path: stringData.queue
-          value: |-
-            CONN_STR=redis+cluster://:@gitea-unittests-valkey-cluster-headless.testing.svc.cluster.local:6379/0?pool_size=100&idle_timeout=180s&
-            TYPE=redis
-
   - it: "queue is configured correctly for valkey"
     template: templates/gitea/config.yaml
     set:
-      valkey-cluster:
-        enabled: false
       valkey:
         enabled: true
     asserts:
@@ -30,14 +13,12 @@ tests:
         equal:
           path: stringData.queue
           value: |-
-            CONN_STR=redis://:changeme@gitea-unittests-valkey-primary.testing.svc.cluster.local:6379/0?pool_size=100&idle_timeout=180s&
+            CONN_STR=redis://:changeme@gitea-unittests-valkey.testing.svc.cluster.local:6379/0?pool_size=100&idle_timeout=180s&
             TYPE=redis
 
-  - it: "queue is configured correctly for 'levelDB' when valkey (and valkey-cluster) is disabled"
+  - it: "queue is configured correctly for 'levelDB' when valkey is disabled"
     template: templates/gitea/config.yaml
     set:
-      valkey-cluster:
-        enabled: false
       valkey:
         enabled: false
     asserts:
@@ -48,11 +29,9 @@ tests:
             CONN_STR=
             TYPE=level
 
-  - it: "queue can be customized when valkey (and valkey-cluster) are disabled"
+  - it: "queue can be customized when valkey is disabled"
     template: templates/gitea/config.yaml
     set:
-      valkey-cluster:
-        enabled: false
       valkey:
         enabled: false
       gitea.config.queue.TYPE: custom-type