feat: authenticate the server's Redis connection

InitRedis now takes a username and password, read from REDIS_USERNAME and
REDIS_PASSWORD, matching what admin has always done. Both empty keeps an
unauthenticated Redis working; a password with an empty username is what a
legacy requirepass instance needs, since go-redis then sends AUTH with one
argument instead of two.

This is what lets a Kubernetes install point at a managed Redis instead of
the bundled one.

server/cmd/main.go

@@ -91,7 +91,9 @@ func main() {
 	services.StartAuditSweeper()
 
 	redisAddr := getEnv("REDIS_ADDR", "localhost:6379")
-	if err := auth.InitRedis(redisAddr); err != nil {
+	redisUser := os.Getenv("REDIS_USERNAME")
+	redisPass := os.Getenv("REDIS_PASSWORD")
+	if err := auth.InitRedis(redisAddr, redisUser, redisPass); err != nil {
 		log.Fatalf("failed to connect to Redis: %v", err)
 	}
 	log.Println("connected to Redis")

server/internal/auth/session.go

@@ -25,8 +25,17 @@ type Session struct {
 
 var rdb *redis.Client
 
-func InitRedis(addr string) error {
-	rdb = redis.NewClient(&redis.Options{Addr: addr})
+// InitRedis connects the session store.
+//
+// Username and password may both be empty for an unauthenticated instance. For
+// a legacy `requirepass` Redis, pass the password with an empty username —
+// go-redis then sends AUTH with one argument instead of two.
+func InitRedis(addr, username, password string) error {
+	rdb = redis.NewClient(&redis.Options{
+		Addr:     addr,
+		Username: username,
+		Password: password,
+	})
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
 	return rdb.Ping(ctx).Err()