How about changing interpretation of version string

Many users who wants use 3.0.x write ruby-version: 3.0 by mistake.

3.0 interpreted as 3 on GitHub Actions.

For example, following workflow step prints 3 only.

        env:
          env_var: 3.0
        run: |
          set -x
          echo ${env_var}

So I propose changing the meaning of 3 (and 3.0 on workflow files) use 3.0.x, and 3.x (or something) use latest 3.x.x.

After this change, many users can write 3.0 intentionally, and some (probably less) users who want use latest 3.x.x can write 3.x or something instead.

首先追踪 ruby-version input 在 GitHub Actions 工作流文件中的解释方式，以报告的环境值 3.0 示例作为动机案例。定义并验证 3、3.0 和 3.x 的预期含义，包括对现有工作流兼容性的影响。