fix(cache): pass useRedisSets option to KeyvRedis cache storage adapter

Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>
Signed-off-by: zcmander <zcmander@gmail.com>

.changeset/clever-numbers-impress.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-defaults': patch
+---
+
+Fixed an issue where the `useRedisSets` configuration for the cache service would have no effect.

packages/backend-defaults/src/entrypoints/cache/CacheManager.ts

@@ -147,7 +147,9 @@ export class CacheManager {
     let store: typeof KeyvRedis | undefined;
     return (pluginId, defaultTtl) => {
       if (!store) {
-        store = new KeyvRedis(this.connection);
+        store = new KeyvRedis(this.connection, {
+          useRedisSets: this.useRedisSets,
+        });
         // Always provide an error handler to avoid stopping the process
         store.on('error', (err: Error) => {
           this.logger?.error('Failed to create redis cache client', err);