Avoid rendering of specific .md files from blogdown::serve_site()

I have a file located at

content/post/data_for_posts/my_file.md

I have it there because it's quite easy to do htmltools::includeMarkdown("data_for_posts/my_file.md") and recycle this file in different posts.

My problem is that when I serve_site() this creates a public/post/data_for_posts/index.html, which means, it gets posted to my website (as a January 1 of 0001). I guess I could change the date to year 10000, but I would rather handle it the way I handle the .Rmd and other files, as suggested here

I have tried to modify my config.toml but have not managed to solve the issue.

ignoreFiles = ["\\.Rmd$", "\\.Rmarkdown$", "_files$", "_cache$", "content/post/data_for_posts/my_file.md"]