Description
This is an extension of #36047. /cc @bradfitz
There are hard-coded lists in the static templates for x/website/cmd/golangorg and x/tools/cmd/godoc, e.g.:
In theory, x/website can be modified to get the list of repos from x/build/repos and pass that list to the template. However, that would require modifying golang.org/x/tools/godoc to either be able to pass data through from x/website, or having golang.org/x/tools/godoc itself get the list from x/build.
There may or may not be a constraint about whether we should add a requirement on x/build to x/tools, since x/tools contains many stable packages, while x/build is more internal and less oriented to be imported by library modules (e.g., see #29935).
I don't think it's worth implementing right now, because it's a lot of forced changes and not a lot of benefit. But there are changes planned in order to resolve #29206, and this may become more viable after that. Filing this issue to track this task.