Enable pushing WIT interfaces via CI

[vados-cosmonic]

It should be possible to publish a WIT interface from the component-docs repo automatically when a certain CI workflow is run.

This will likely require the following:

1. Adding bytecodealliance/component-docs to the docs:adder package list of allowed repositories
2. Creating a CI job that pushes versions of the docs/adder WIT (using the built-in github.token)
3. Ensure that we're running wkg publish on the textual WIT directory (not a built component implementation) -- we should be able to get a minimal WIT-only component

[kate-goldenring]

@vados-cosmonic there is a GitHub action that the BA created to help with this: https://github.com/bytecodealliance/component-docs/issues/243#issuecomment-2824738056