ci: Add WSL testing workflow for Windows

[watilde]

This commit introduces a new GitHub Actions workflow for running Node.js builds and tests within a Windows Subsystem for Linux (WSL) environment.

WSL is used by nearly 15-17% of developers as their development environment, and I believe we should add CI testing for it. However, since GitHub Actions would significantly increase build times, it might be better to add this to https://ci.nodejs.org/ instead.

Refs: https://survey.stackoverflow.co/2025/technology

I'd like to hear the subteam's thoughts on this approach.

[nodejs-github-bot]

Review requested:

• @nodejs/actions

[legendecas]

There is an existing windows workflow at https://github.com/nodejs/node/blob/main/.github/workflows/coverage-windows.yml.

We could name this as test-wsl to avoid name confusion, or merge the two into one workflow file.

[watilde]

Thank you for your comment. That one seems to be running in a native Windows environment instead of WSL. We can add WSL env into that file tho

[avivkeller]

IMO testing on WSL is almost identical to testing on Linux. Any issues building would be a result of WSL bugs, not Node.js ones, and the built executable will function identically to the Linux one, right?

[richardlau]

IMO testing on WSL is almost identical to testing on Linux. Any issues building would be a result of WSL bugs, not Node.js ones, and the built executable will function identically to the Linux one, right?

FWIW we state this:

node/BUILDING.md

Lines 139 to 145 in 01e44dc

	[^3]: The Windows Subsystem for Linux (WSL) is not
	supported, but the GNU/Linux build process and binaries should work. The
	community will only address issues that reproduce on native GNU/Linux
	systems. Issues that only reproduce on WSL should be reported in the
	[WSL issue tracker](https://github.com/Microsoft/WSL/issues). Running the
	Windows binary (`node.exe`) in WSL will not work without workarounds such as
	stdio redirection.

[watilde]

@avivkeller @richardlau Thank you for letting me know that! Closing as not needed per BUILDING.md