browser not launching in Windows in GitHub Actions

[trusktr]

I've ported tests in Lume from Karma to WTR, and it is amaaaaaazing.

However, although tests run fine for me in Windows locally, in GitHub Actions they fail to load the browser.

Here's sample build from that PR:

https://github.com/lume/lume/actions/runs/6701354377/job/18208981742?pr=287

There's this message in the output:

 ❌ The browser was unable to create and start a test page after 30000ms. You can increase this timeout with the browserStartTimeout option. 

The config does not specify browsers, just uses test-runner's default in this case.

Linux and macOS builds are passing with flying colors. Any idea why it might work in my local PowerShell but not in GitHub Actions?

Related issue:

• Error while running tests - The browser was unable to create and start a test page after 30000ms #1456