Add non-clustered redis as sub-chart (#672)

Co-authored-by: Julien <julienym@gmail.com>
Co-authored-by: justusbunsi <sk.bunsenbrenner@gmail.com>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/672
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: pat-s <patrick.schratz@gmail.com>
Co-committed-by: pat-s <patrick.schratz@gmail.com>

values.yaml

@@ -481,10 +481,13 @@ gitea:
     failureThreshold: 10
 
 ## @section redis-cluster
-## @param redis-cluster.enabled Enable redis
+## @param redis-cluster.enabled Enable redis cluster
 ## @param redis-cluster.usePassword Whether to use password authentication
 ## @param redis-cluster.cluster.nodes Number of redis cluster master nodes
 ## @param redis-cluster.cluster.replicas Number of redis cluster master node replicas
+## @descriptionStart
+## Redis cluster and [Redis](#redis) cannot be enabled at the same time.
+## @descriptionEnd
 redis-cluster:
   enabled: true
   usePassword: false
@@ -492,6 +495,23 @@ redis-cluster:
     nodes: 3 # default: 6
     replicas: 0 # default: 1
 
+## @section redis
+## @param redis.enabled Enable redis standalone or replicated
+## @param redis.architecture Whether to use standalone or replication
+## @param redis.global.redis.password Required password
+## @param redis.master.count Number of Redis master instances to deploy
+## @descriptionStart
+## Redis and [Redis cluster](#redis-cluster) cannot be enabled at the same time.
+## @descriptionEnd
+redis:
+  enabled: false
+  architecture: standalone
+  global:
+    redis:
+      password: changeme
+  master:
+    count: 1
+
 ## @section PostgreSQL HA
 #
 ## @param postgresql-ha.enabled Enable PostgreSQL HA