ci: update markdownlint setup (#1813)

* Fail when markdownlint fails

* Use markdown lint config file in action

---------

Co-authored-by: Ariel Valentin <[email protected]>

Author: thompson-tomo

.github/workflows/ci-markdown-checks.yml

@@ -20,8 +20,8 @@ jobs:
       # equivalent cli: markdownlint-cli2  "**/*.md" "#**/CHANGELOG.md"  --config .markdownlint.json
       - name: "Markdown Lint Check"
         uses: DavidAnson/markdownlint-cli2-action@v21
-        continue-on-error: true
         with:
+          config: .markdownlint.json
           fix: false
           globs: |
             **/*.md