Ensure log path is created on startup

options.go

@@ -1,6 +1,11 @@
 package msgbus
 
-import "github.com/tidwall/wal"
+import (
+	"fmt"
+	"os"
+
+	"github.com/tidwall/wal"
+)
 
 const (
 	// DefaultBind is the default bind address
@@ -55,6 +60,9 @@ type Option func(opts *Options) error
 
 func WithLogPath(logPath string) Option {
 	return func(opts *Options) error {
+		if err := os.MkdirAll(logPath, 0755); err != nil {
+			return fmt.Errorf("error creating log path %s: %w", logPath, err)
+		}
 		opts.LogPath = logPath
 		return nil
 	}