Support CSP headers generation for static content on Cloudflare

[castarco]

To improve the usability of Astro-Shield, it would be good to support the generation of headers metadata specific for the Cloudflare provider, so we can generate CSP headers for static content.

Reference

• See public/_headers file
• See https://docs.astro.build/en/guides/integrations-guide/cloudflare/#headers

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[jacobpretorius]

I've hacked together a very simple temporary workaround for anyone who needs to get going with SRI headers in their CSP with Cloudflare Pages while this actual proper implementation is open.

Feel free to use the code snippets in my example to do the same if you want.