Use core.platform.getDetails()

[eregon]

From #691 (comment)

[eregon]

From https://github.com/eregon/actions-shell/actions/runs/15650626198/job/44094885279#step:4:84

 Running await core.platform.getDetails()
Error: Error: Unable to locate executable file: lsb_release. Please verify either the file path exists or the file can be found within a directory specified by the PATH environment variable. Also check the file mode to verify the file is executable.
at Object.<anonymous> (/__w/_actions/eregon/setup-ruby/investigate/dist/index.js:9866:27)
at Generator.next (<anonymous>)
at fulfilled (/__w/_actions/eregon/setup-ruby/investigate/dist/index.js:9719:58)

So core.platform.getDetails() seems to not work on non-GitHub-hosted images or inside containers, and the error is unclear, so that doesn't seem usable.