manifest cross-origin issues

[simllll]

Hi all,
I ran into some troubles with the manifest json since I changed the publicPath to a cdn.
If i run lighthouse it complains about same-origin policy for the manifest file. Even though I found w3c/manifest#360 and it tunrs out cross origin should work just fine, the browser and several testing scenarios complain about it if the manifest is delivered by a different host.

I think it would be a easy fix if I can overwrite the publicPath within manifest module (I did the same for workbox ;), unfortantuly as I checked the source code of the manifest module I couldn't figure it out how to apply a different publicPath in this case.

Would be great to add an option to overwrite the public path, If you want me to I can create a PR and try to fix it up?

Thanks
Simon

Lighthouse report - 1 failed Audit:
User can be prompted to Install the Web App
Browsers can proactively prompt users to add your app to their homescreen, which can lead to higher engagement. Learn more.
Warnings: ERROR: start_url must be same-origin as document

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[pi0]

Hey. I just didn't get the point but PRs welcome (And it would be 2x awesome if you can add some small docs about CDN usage). Thanks :)