tsconsensus: enable writing state to disk

The comments in the raft code say to only use the InMemStore for tests.

Updates #16027

Signed-off-by: Fran Bull <fran@tailscale.com>

tsconsensus/bolt_store_no_bolt.go

@@ -0,0 +1,18 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build loong64
+
+package tsconsensus
+
+import (
+	"errors"
+
+	"github.com/hashicorp/raft"
+)
+
+func boltStore(path string) (raft.StableStore, raft.LogStore, error) {
+	// "github.com/hashicorp/raft-boltdb/v2" doesn't build on loong64
+	// see https://github.com/hashicorp/raft-boltdb/issues/27
+	return nil, nil, errors.New("not implemented")
+}