Added lint support to GH workflow

Author: carlos.tasada

.github/workflows/build.yml

@@ -37,6 +37,18 @@ jobs:
           files: docs
           fail_on_error: true
 
+      - name: Lint md files
+        uses: DavidAnson/markdownlint-cli2-action@v16
+        with:
+          config: '.markdownlint.json'
+          globs: './docs/**/*.md'
+
+      - name: Lint mdx files
+        uses: DavidAnson/markdownlint-cli2-action@v16
+        with:
+          config: '.markdownlintx.json'
+          globs: './docs/**/*.mdx'
+
       - name: Deploy to GitHub Pages
         if: github.ref == 'refs/heads/master'
         uses: peaceiris/actions-gh-pages@v3