Rewrite ruby/setup-msys2-gcc

[ntkme]

This PR include a few changes for windows:

• Fix the issue with gcc 15 vs gcc 14 by introducing flexible variants of toolchains.
• Reduce friction with Rewrite setup-msys2-gcc#26.
• Improves performance by install to fast disk and create junction link on slow disk.
  • Ruby is installed to $RUNNER_TEMP\$base and a junction link is created at original $rubyPrefix.
  • MSYS2 is installed to $RUNNER_TEMP\msys64 and a junction link is created at $rubyPrefix\msys64.
• Improves the reliability of ridk enable step by using proper serialization.
• Refactor and clean up tech debt.

Performance

Run to run improvement varies a lot due to different sizes of packages and the unstable performance of the slow disk.
However, in general this saves anywhere from 20s to 60s per run. Example of a performance improvement from 63.43s to 27.15s - or 36.38s in saving:

https://github.com/ruby/setup-ruby/actions/runs/14772696897/job/41475457782

Downloading Ruby
  https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.3-1/rubyinstaller-3.4.3-1-x64.7z
  Took   0.97 seconds
Extracting  Ruby
  Took  25.38 seconds
Modifying Path
Downloading msys2 build tools
  https://github.com/ruby/setup-msys2-gcc/releases/download/msys2-gcc-pkgs/msys2.7z
  Took   0.73 seconds
Extracting  msys2 build tools
  Took  12.52 seconds
Downloading ucrt64-3.0 build tools
  https://github.com/ruby/setup-msys2-gcc/releases/download/msys2-gcc-pkgs/ucrt64-3.0.7z
  Took   1.00 seconds
Extracting  ucrt64-3.0 build tools
  Took  22.83 seconds

https://github.com/ntkme/setup-ruby/actions/runs/14823150160/job/41612838924

Downloading Ruby
  https://github.com/oneclick/rubyinstaller2/releases/download/RubyInstaller-3.4.3-1/rubyinstaller-3.4.3-1-x64.7z
  Took   0.46 seconds
Extracting  Ruby
  Took   9.87 seconds
Modifying Path
Downloading msys2 build tools
  https://github.com/ntkme/setup-msys2-gcc/releases/latest/download/msys2-ucrt64-gcc@14.7z
  Took   1.18 seconds
Extracting  msys2 build tools
  Took  15.64 seconds

---

Note regarding why use $rubyPrefix\msys64:

• ENV["MSYS2_PATH"] have highest priority, but it's only supported on ruby >=3.0.7: oneclick/rubyinstaller2@a4590dd
• $rubyPrefix\msys64 has the second highest priority, and it's supported by ruby >=2.4.1: oneclick/rubyinstaller2@21a416f

>=2.4.1 means $rubyPrefix\msys64 is supported by all currently available ruby installer versions that's linked with msys2, and it has higher priority than C:\msys64 so that we don’t need to touch the preinstalled C:\msys64 at all.

[MSP-Greg]

Curious, why the need for 'Revert back to use GITHUB_WORKSPACE to detect fast drive'?

[ntkme]

Curious, why the need for 'Revert back to use GITHUB_WORKSPACE to detect fast drive'?

Sorry, was just testing something and pushed to the wrong branch.

[MSP-Greg]

@eregon

I've quickly looked as this, and everything seems ok. We're getting close to finalizing the changes to setup-msys2-gcc, so checking is this is okay. Once the new packages are created, this can be merged.