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.

Comienza rastreando cómo se interpreta la entrada ruby-version en los archivos de workflow de GitHub Actions, utilizando como caso motivador el ejemplo reportado del valor de entorno 3.0. Define y verifica los significados previstos de 3, 3.0 y 3.x, incluido el impacto en la compatibilidad de los workflows existentes.