Refactor Loki configuration to disable memberlist and caching services, and update S3 credentials reference

apps/logging/loki/values.yaml

@@ -10,6 +10,16 @@ loki:
   write:
     replicas: 0
   
+  # Disable memberlist for single binary
+  memberlist:
+    enable_ipv6: false
+  
+  # Disable caching services for single binary
+  chunksCache:
+    enabled: false
+  resultsCache:
+    enabled: false
+  
   loki:
     # Authentication
     auth_enabled: false
@@ -102,12 +112,12 @@ loki:
       - name: AWS_ACCESS_KEY_ID
         valueFrom:
           secretKeyRef:
-            name: loki-objstore-secret
+            name: loki-logs
             key: AWS_ACCESS_KEY_ID
       - name: AWS_SECRET_ACCESS_KEY
         valueFrom:
           secretKeyRef:
-            name: loki-objstore-secret
+            name: loki-logs
             key: AWS_SECRET_ACCESS_KEY
   
   # Gateway
@@ -147,14 +157,3 @@ extraObjects:
       storageClassName: ceph-bucket
       additionalConfig:
         maxSize: "200Gi"
-  
-  # Secret with S3 credentials (populated by Rook from OBC)
-  - apiVersion: v1
-    kind: Secret
-    metadata:
-      name: loki-objstore-secret
-      namespace: logging
-    type: Opaque
-    stringData:
-      AWS_ACCESS_KEY_ID: placeholder
-      AWS_SECRET_ACCESS_KEY: placeholder