Chore: Add username option for redis remote cache (#101787)

* Chore: Add username option for redis remote cache

(cherry picked from commit 25e28dc85e)

* Chore: Update docs and config with sample Redis conn with user+pass

---------

Co-authored-by: Thomas Fournier <tfournier@evolves.fr>

pkg/infra/remotecache/redis_storage.go

@@ -39,6 +39,8 @@ func parseRedisConnStr(connStr string) (*redis.Options, error) {
 		switch connKey {
 		case "addr":
 			options.Addr = connVal
+		case "username":
+			options.Username = connVal
 		case "password":
 			options.Password = connVal
 		case "db":

pkg/infra/remotecache/redis_storage_test.go

@@ -16,11 +16,12 @@ func Test_parseRedisConnStr(t *testing.T) {
 		ShouldErr     bool
 	}{
 		"all redis options should parse": {
-			"addr=127.0.0.1:6379,pool_size=100,db=1,password=grafanaRocks,ssl=false",
+			"addr=127.0.0.1:6379,pool_size=100,db=1,username=grafana,password=grafanaRocks,ssl=false",
 			&redis.Options{
 				Addr:      "127.0.0.1:6379",
 				PoolSize:  100,
 				DB:        1,
+				Username:  "grafana",
 				Password:  "grafanaRocks",
 				Network:   "tcp",
 				TLSConfig: nil,