This page is very hard to find in search engines (specifically Duck Duck Go) for some reason

### Existing documentation URL(s)

https://developers.cloudflare.com/workers/ci-cd/builds/configuration/#default-variables

### What changes are you suggesting?

I was looking for a list of the built-in environment variables that Workers provides and could not find this page. I had used these in the past but needed to see the list because I couldn't remember the exact names. I eventually got an AI search result that told me about WORKERS_CI, but neither cited source actually mentioned it. So I searched for "WORKERS_CI cloudflare" and it still didn't come up. I finally had to ask the AI for the URL of the page it got the documentation of WOKERS_CI from. I'm bookmarking it now for myself but this was oddly difficult to find (in comparison, the equivalent page for Pages comes up easily).

### Additional information

_No response_