Add Redis password support to KV cache scorer

Introduced handling for a new environment variable `KVCACHE_INDEXER_REDIS_PWD` to enable optional Redis password configuration. This improves flexibility for connecting to secured Redis instances.

Signed-off-by: Tyler Lisowski <lisowski@us.ibm.com>

Author: relyt0925

pkg/scheduling/plugins/scorer/kvcache-aware.go

@@ -17,8 +17,9 @@ import (
 const (
 	kvCacheAwareScorerName = "kvcache-aware-scorer"
 
-	kvCacheRedisEnvVar     = "KVCACHE_INDEXER_REDIS_ADDR"
-	huggingFaceTokenEnvVar = "HF_TOKEN"
+	kvCacheRedisEnvVar         = "KVCACHE_INDEXER_REDIS_ADDR"
+	kvCacheRedisPasswordEnvVar = "KVCACHE_INDEXER_REDIS_PWD"
+	huggingFaceTokenEnvVar     = "HF_TOKEN"
 )
 
 // KVCacheAwareScorer uses the KVCacheIndexer to score pods based on KVCache
@@ -42,6 +43,11 @@ func NewKVCacheAwareScorer(ctx context.Context) (plugins.Scorer, error) {
 		return nil, fmt.Errorf("environment variable %s is not set", kvCacheRedisEnvVar)
 	}
 
+	redisPassword := os.Getenv(kvCacheRedisPasswordEnvVar)
+	if redisPassword != "" {
+		config.KVBlockIndexerConfig.RedisPassword = redisAddr
+	}
+
 	hfToken := os.Getenv(huggingFaceTokenEnvVar)
 	if hfToken != "" {
 		config.TokenizersPoolConfig.HuggingFaceToken = hfToken