A custom GitHub action that is used by LLS-Addons to get some metadata on addons such as their size and if they contain a plugin.
This is very niche so there is probably no other use case than when being used by LLS-Addons.
It expects that the repo has been checked out, including its submodules. It will then get a list of all submodules, get their metadata, and then write it to their info.json file. This allows the addon manager of vscode-lua to have metadata on the addon without pulling the whole submodule first.