.eleventyignore: Ignore a whole folder except for one template file

[xplosionmind]

Hi all!

I have a git submodule that I am adding inside the repository of my website, but I want it to be ignored, except for its README.md.

I have tried two different approaches. In both cases I am able to exclude the git submodule, but I can’t find a way to include the README and use it as a regular template.

Option 1: using .eleventyignore

inputdir/submodule
!inputdir/submodule/README.md

Option 2: using .eleventy.js

module.exports = function (eleventyConfig) {
  eleventyConfig.ignores.add('inputdir/submodule');
  eleventyConfig.ignores.add('inputdir/submodule/README.md'); // added it first to be sure
  eleventyConfig.ignores.delete('inputdir/submodule/README.md');
};

Do you have any suggestions to fix this?

Thanks a lot!

(cross-posted on Discord)