build: Add rector as part of the process #5

	# Fallback workflow to be able to have the branch protection enabled at all times.
	name: Null Docs

	on:
	# To be aware it need to be the counter-part of docs.yaml.
	pull_request:
	paths-ignore:
	- doc/**
	- mkdocs.yaml
	- .github/workflows/docs.yaml

	# See https://stackoverflow.com/a/72408109
	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	# This is a "trick", a meta task which does not change, and we can use in
	# the protected branch rules as opposed to the tests one above which
	# may change regularly.
	validate-tests:
	name: Docs status
	runs-on: ubuntu-latest
	steps:
	- name: Successful run
	run: exit 0

Provide feedback