Add GitHub action to run markdownlint on PRs

.github/workflows/markdownlint.yml

@@ -0,0 +1,37 @@
+name: Markdown lint
+
+on:
+  pull_request:
+    branches: [master]
+
+jobs:
+  markdownlint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Get changed markdown files
+        id: changed
+        run: |
+          files=$(git diff --name-only --diff-filter=d origin/${{ github.base_ref }}...HEAD -- '*.md')
+          if [ -z "$files" ]; then
+            echo "files=" >> "$GITHUB_OUTPUT"
+            echo "No changed markdown files found."
+          else
+            echo "files<<EOF" >> "$GITHUB_OUTPUT"
+            echo "$files" >> "$GITHUB_OUTPUT"
+            echo "EOF" >> "$GITHUB_OUTPUT"
+            echo "Changed markdown files:"
+            echo "$files"
+          fi
+
+      - name: Install markdownlint
+        if: steps.changed.outputs.files != ''
+        run: sudo apt-get install -y markdownlint
+
+      - name: Run markdownlint
+        if: steps.changed.outputs.files != ''
+        run: echo "${{ steps.changed.outputs.files }}" | xargs mdl

libblockdev/libblockdev.md

@@ -38,3 +38,6 @@ Following storage technologies are supported by libblockdev
  - NVDIMM namespaces (deprecated)
  - NVMe
  - SMART
+
+
+*a**