Add markdown linting script (#2585)

.github/workflows/lint.yml

@@ -0,0 +1,32 @@
+name: Lint
+
+on:
+  pull_request: null
+
+env:
+  NODE: 22
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v6
+
+      - name: Install PNPM
+        uses: pnpm/action-setup@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: "${{ env.NODE }}"
+          cache: 'pnpm'
+
+      - name: Install pnpm dependencies
+        run: pnpm install
+
+      - name: Lint Markdown
+        run: pnpm run lint