ci(pr-check-lint_content): refine workflow

[caugner]

Description

Refines the pr-check-lint_content:

1. Move only Markdown files, ignoring any non-Markdown files.
2. Run the workflow on pull_request if the workflow itself gets changed.
3. Lint Markdown files in the root directory.
4. Separate tools into different steps, with diff after each step.

Motivation

1. Avoid unintended side-effects of non-Markdown files on linting tools.
2. Ensure workflow regressions are noticed before merging changes.
3. Ensure workflow runs properly on PRs that only touch root Markdown files.
4. Make it easier to identify which tool introduced a change.

Additional details

See this test run with example changes (92ef06c).

Related issues and pull requests

[github-actions]

[mdn-linter] _{reported by reviewdog 🐶}

Suggested change

	Test
	Test

[github-actions]

Preview URLs (1 page)

• /en-US/docs/Web

(comment last updated: 2026-02-09 20:58:25)