feat: add new attribute to link tag for manifest.json

[gyarasu]

In the case of Basic Authentication, manifest.json isn't downloaded properly.
To solve this problem, I added the crossorigin attribute for link tag.
We can set the attribute as below.

modules: [
  ['@nuxtjs/pwa', {manifest: {crossorigin: "use-credentials"}}],
],

As a result, link tag is generated as below.

<link data-n-head="true" rel="manifest" href="/_nuxt/manifest.json" crossorigin="use-credentials"/>

regards
Hiroki

[XanderLuciano]

Tested and verified as functional.
Backwards compatible with current manifest file as well.

Have not run into any issues.

[AndrewBogdanovTSS]

I tried it like @gyarasu suggested

modules: [
  ['@nuxtjs/pwa', {manifest: {crossorigin: "use-credentials"}}],
],

but still crossorigin attribute isn't added to my manifest link, in the source code it appears as

<link data-n-head="true" rel="manifest" href="/site.webmanifest">