How to add custom graby-site-config to Wallabag docker version?

[jeff47]

How can I add a custom graby-site-config to the docker version of Wallabag? /var/www/wallabag/vendor/j0k3r/graby-site-config has many files in it, so I can't map it to a host directory and add my custom file there. But I can't add it directly to the image, of course, or it won't persist.