Add Ruby shared library

[y-yagi]

Tool information

• Tool name: Ruby shared library
• Add or update? Add
• Desired version: Latest
• Approximate size:
• If this is an add request:
  • Brief description of tool: GitHub Actions Virtual Environments already supported Ruby but it seems it does not build with a shared library. The shared library need when use libraries like using FFI.
  • URL for tool's homepage:

Virtual environments affected

• macOS 10.14
• Ubuntu 16.04 LTS
• Ubuntu 18.04 LTS
• Windows Server 2016 R2
• Windows Server 2019

Can this tool be installed during the build?
Yes

Are you willing to submit a PR?
Yes

[eregon]

The shared library need when use libraries like using FFI.

Could you give an example?
The FFI gem doesn't need libruby at least.

[ankane]

A few examples are Rice and gems that depend on it (like Torch-rb and fastText). Here's the error message from Rice:

Unfortunately Rice does not build against a staticly linked Ruby.
You'll need to rebuild Ruby with --enable-shared to use this library.

If you're on rvm:    rvm reinstall [version] -- --enable-shared
If you're on rbenv:  CONFIGURE_OPTS="--enable-shared" rbenv install [version]
If you're on Heroku: upgrade your stack to heroku-16 or later

[maxim-lobanov]

Hello, recently we have switched Ruby to official Ruby binaries for all os. Currently, binaries are consumed from https://github.com/ruby/ruby-builder
As far as I know, new binaries use shared libraries and this issue can be resolved.
Please let me know if you have any concerns