chore(deps)!: Migrate to Valkey from Redis (#775)

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### Description of the change

Migrates from Redis to Valkey.

### Benefits

The Redis License is changing from BSD-3-Clause to RSALv2 and SSPLv1 which are not open source under the OSI definition. We should consider open-source alternatives as a default replacement for Redis.

### Possible drawbacks

Large scale change, potentially breaking.

### Applicable issues

https://github.com/go-gitea/gitea/issues/32056

### ⚠ BREAKING

Major version change, redis provider changed to valkey.

### Checklist

<!-- [Place an '[X]' (no spaces) in all applicable fields. Please remove unrelated fields.] -->

- [X] Parameters are documented in the `values.yaml` and added to the `README.md` using [readme-generator-for-helm](https://github.com/bitnami-labs/readme-generator-for-helm)
- [X] Breaking changes are documented in the `README.md`
- [X] Helm templating unittests are added (required when changing anything in `templates` folder)

Co-authored-by: pat-s <patrick.schratz@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/775
Reviewed-by: pat-s <pat-s@noreply.gitea.com>
Co-authored-by: Sean Teo <sawntoe@gmail.com>
Co-committed-by: Sean Teo <sawntoe@gmail.com>

unittests/helm/dependency-checks/customization-integrity-valkey-cluster.yaml

@@ -1,19 +1,19 @@
-suite: Dependency checks | Customization integrity | redis-cluster
+suite: Dependency checks | Customization integrity | valkey-cluster
 release:
   name: gitea-unittests
   namespace: testing
 set:
-  redis:
+  valkey:
     enabled: false
-  redis-cluster:
+  valkey-cluster:
     enabled: true
     usePassword: false
     cluster:
       nodes: 5
       replicas: 2
 tests:
-  - it: "[redis-cluster] configures correct nodes/replicas"
-    template: charts/redis-cluster/templates/redis-statefulset.yaml
+  - it: "[valkey-cluster] configures correct nodes/replicas"
+    template: charts/valkey-cluster/templates/valkey-statefulset.yaml
     asserts:
       - documentIndex: 0
         equal:
@@ -22,31 +22,31 @@ tests:
       - documentIndex: 0
         matchRegex:
           path: spec.template.spec.containers[0].args[0]
-          pattern: REDIS_CLUSTER_REPLICAS="2"
-  - it: "[redis-cluster] support auth-less connections"
+          pattern: VALKEY_CLUSTER_REPLICAS="2"
+  - it: "[valkey-cluster] support auth-less connections"
     asserts:
-      - template: charts/redis-cluster/templates/secret.yaml
+      - template: charts/valkey-cluster/templates/secret.yaml
         hasDocuments:
           count: 0
-      - template: charts/redis-cluster/templates/redis-statefulset.yaml
+      - template: charts/valkey-cluster/templates/valkey-statefulset.yaml
         documentIndex: 0
         contains:
           path: spec.template.spec.containers[0].env
           content:
             name: ALLOW_EMPTY_PASSWORD
             value: "yes"
-  - it: "[redis-cluster] support auth-full connections"
+  - it: "[valkey-cluster] support auth-full connections"
     set:
-      redis-cluster:
+      valkey-cluster:
         usePassword: true
     asserts:
-      - template: charts/redis-cluster/templates/secret.yaml
+      - template: charts/valkey-cluster/templates/secret.yaml
         containsDocument:
           kind: Secret
           apiVersion: v1
-          name: gitea-unittests-redis-cluster
+          name: gitea-unittests-valkey-cluster
           namespace: testing
-      - template: charts/redis-cluster/templates/redis-statefulset.yaml
+      - template: charts/valkey-cluster/templates/valkey-statefulset.yaml
         documentIndex: 0
         contains:
           path: spec.template.spec.containers[0].env
@@ -54,25 +54,25 @@ tests:
             name: REDISCLI_AUTH
             valueFrom:
               secretKeyRef:
-                name: gitea-unittests-redis-cluster
-                key: redis-password
-      - template: charts/redis-cluster/templates/redis-statefulset.yaml
+                name: gitea-unittests-valkey-cluster
+                key: valkey-password
+      - template: charts/valkey-cluster/templates/valkey-statefulset.yaml
         documentIndex: 0
         contains:
           path: spec.template.spec.containers[0].env
           content:
-            name: REDIS_PASSWORD
+            name: REDISCLI_AUTH
             valueFrom:
               secretKeyRef:
-                name: gitea-unittests-redis-cluster
-                key: redis-password
-  - it: "[redis-cluster] renders the referenced service"
-    template: charts/redis-cluster/templates/headless-svc.yaml
+                name: gitea-unittests-valkey-cluster
+                key: valkey-password
+  - it: "[valkey-cluster] renders the referenced service"
+    template: charts/valkey-cluster/templates/headless-svc.yaml
     asserts:
       - containsDocument:
           kind: Service
           apiVersion: v1
-          name: gitea-unittests-redis-cluster-headless
+          name: gitea-unittests-valkey-cluster-headless
           namespace: testing
       - documentIndex: 0
         contains:
@@ -81,10 +81,10 @@ tests:
             name: tcp-redis
             port: 6379
             targetPort: tcp-redis
-  - it: "[gitea] waits for redis-cluster to be up and running"
+  - it: "[gitea] waits for valkey-cluster to be up and running"
     template: templates/gitea/init.yaml
     asserts:
       - documentIndex: 0
         matchRegex:
           path: stringData["configure_gitea.sh"]
-          pattern: nc -vz -w2 gitea-unittests-redis-cluster-headless.testing.svc.cluster.local 6379
+          pattern: nc -vz -w2 gitea-unittests-valkey-cluster-headless.testing.svc.cluster.local 6379

unittests/helm/dependency-checks/customization-integrity-valkey.yaml

@@ -1,40 +1,40 @@
-suite: Dependency checks | Customization integrity | redis
+suite: Dependency checks | Customization integrity | valkey
 release:
   name: gitea-unittests
   namespace: testing
 set:
-  redis-cluster:
+  valkey-cluster:
     enabled: false
-  redis:
+  valkey:
     enabled: true
     architecture: standalone
     global:
-      redis:
+      valkey:
         password: gitea-password
     master:
       count: 2
 tests:
-  - it: "[redis] configures correct 'master' nodes"
-    template: charts/redis/templates/master/application.yaml
+  - it: "[valkey] configures correct 'master' nodes"
+    template: charts/valkey/templates/primary/application.yaml
     asserts:
       - documentIndex: 0
         equal:
           path: spec.replicas
-          value: 2
-  - it: "[redis] redis.global.redis.password is applied as expected"
-    template: charts/redis/templates/secret.yaml
+          value: 1
+  - it: "[valkey] valkey.global.valkey.password is applied as expected"
+    template: charts/valkey/templates/secret.yaml
     asserts:
       - documentIndex: 0
         equal:
-          path: data["redis-password"]
+          path: data["valkey-password"]
           value: "Z2l0ZWEtcGFzc3dvcmQ="
-  - it: "[redis] renders the referenced service"
-    template: charts/redis/templates/headless-svc.yaml
+  - it: "[valkey] renders the referenced service"
+    template: charts/valkey/templates/headless-svc.yaml
     asserts:
       - containsDocument:
           kind: Service
           apiVersion: v1
-          name: gitea-unittests-redis-headless
+          name: gitea-unittests-valkey-headless
           namespace: testing
       - documentIndex: 0
         contains:
@@ -43,10 +43,10 @@ tests:
             name: tcp-redis
             port: 6379
             targetPort: redis
-  - it: "[gitea] waits for redis to be up and running"
+  - it: "[gitea] waits for valkey to be up and running"
     template: templates/gitea/init.yaml
     asserts:
       - documentIndex: 0
         matchRegex:
           path: stringData["configure_gitea.sh"]
-          pattern: nc -vz -w2 gitea-unittests-redis-headless.testing.svc.cluster.local 6379
+          pattern: nc -vz -w2 gitea-unittests-valkey-headless.testing.svc.cluster.local 6379

unittests/helm/dependency-checks/major-image-bump.yaml

@@ -29,29 +29,29 @@ tests:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
           pattern: bitnami/postgresql:17.+$
-  - it: "[redis-cluster] ensures we detect major image version upgrades"
-    template: charts/redis-cluster/templates/redis-statefulset.yaml
+  - it: "[valkey-cluster] ensures we detect major image version upgrades"
+    template: charts/valkey-cluster/templates/valkey-statefulset.yaml
     set:
-      redis-cluster:
+      valkey-cluster:
         enabled: true
-      redis:
+      valkey:
         enabled: false
     asserts:
       - documentIndex: 0
         matchRegex:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
-          pattern: bitnami/redis-cluster:7.+$
-  - it: "[redis] ensures we detect major image version upgrades"
-    template: charts/redis/templates/master/application.yaml
+          pattern: bitnami/valkey-cluster:8.+$
+  - it: "[valkey] ensures we detect major image version upgrades"
+    template: charts/valkey/templates/primary/application.yaml
     set:
-      redis-cluster:
+      valkey-cluster:
         enabled: false
-      redis:
+      valkey:
         enabled: true
     asserts:
       - documentIndex: 0
         matchRegex:
           path: spec.template.spec.containers[0].image
           # IN CASE OF AN INTENTIONAL MAJOR BUMP, ADJUST THIS TEST
-          pattern: bitnami/redis:7.+$
+          pattern: bitnami/valkey:8.+$