[collection] Ignore directory starting with _ as version from git source

[pocke]

The git source should allow for putting a directory starting with _ in a gem directory.

Background

I'm planning to introduce a new reviewing system to https://github.com/ruby/gem_rbs_collection.
In the new system, I'll add a new file to describe who is responsible for the gem. For example: (The file name is tentative)

.
└── gems
    └── rails
        ├── 7.0
        └── _reviewers.yaml

But rbs collection interprets _reviewers.yaml as a version. It is unexpected behavior.

Solution

Ignore files/directories starting with _ as a version.

Ignoring files starting with _ is an existing convention in RBS. So I think this behavior is natural for the users.

This solution has another advantage. We can use a directory starting with _ for another purpose. For example, we can put an RBS generator for the gem in the directory.

[soutaro]

👍