workflows/ci_docs: fix documentation deployment (#13819)
workflows/ci_docs: fix documentation deployment (#13819)

* workflows/ci_docs: fix docs publishing

It turns out that github.ref is the full ref name, so we have to be a
bit more specific.

See https://developer.github.com/v3/activity/events/types/#pushevent

Also fixed a silly typo :)

* workflows/ci_docs: run CI when there are changes to the workflow
dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim,dom96/Nim