add cloudflare workers static assets example

[alexanderniebuhr]

Changes

• this pr adds a new example which has the "minimal" setup needed for Cloudflare Workers Static Assets deployment
• it does not include all the features or advanced Cloudflare usages

Testing

• pnpm create astro@latest -- --template cloudflare-workers-static-assets

Docs

Not really needed, since custom examples are already documented here: https://docs.astro.build/en/install-and-setup/#use-a-theme-or-starter-template

@sarah11918 we could discuss if we want to add this command pnpm create astro@latest -- --template cloudflare-workers-static-assets to the Cloudflare docs page itself?

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[sarah11918]

Re: adding the template instructions to the Cloudflare adapter page, we don't really have a precedent for that yet!

I'd probably be more inclined to consider it if this is basic setup that every Cloudflare user wants/needs. If this is an example of one specific thing that you might want to do with Cloudflare, then maybe less inclined. It's also thinking of who is in docs and when: if someone is mostly reading these docs to work on already existing projects, then the example is maybe a little less helpful for them at this point? (It could be helpful as a model for them to look at to see how it's done. But since these are typically fresh projects we mostly consider pointing people to them when we believe they are in a "getting started with a new project" state.)

But it does raise maybe a bigger question re: should we be pointing out these examples that we have in appropriate places in docs.

Also, I'm not sure what (if anything!) we need to add to this to get it to show up on https://astro.new in the right category (I guess we would consider this a "Template"?) so just making sure that you've done whatever is needed there, too! I think this is where the logic in that repo is: https://github.com/withastro/astro.new/blob/main/src/data/examples-shared.ts