Real bug found in v2.1.0: ubuntu-runner zip preserved LF line endings, which
breaks Windows batch parsing. cmd.exe mis-tokenized 'setlocal' as 'local',
trashed env vars, and produced 'URL: //node--win-x64.zip' on Node download.
Symptom: Windows users who unzip and double-click setup.bat see a flood of
'XXX is not recognized as a command' errors followed by curl 'No host part'.
Fix: convert .bat/.cmd/.ps1 to CRLF, ensure .sh/.command/.mjs stay LF, before
zipping in the portable-skeleton job.
c99b52e8e2