Add CI for checking markdown format. (#837)

Signed-off-by: ChenYing Kuo <[email protected]>

.github/workflows/build-check.yaml

@@ -295,3 +295,12 @@ jobs:
           CMAKE_GENERATOR=Ninja ASAN=ON make
           python3 ./build/tests/no_router.py
         timeout-minutes: 5
+
+  markdown_lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: DavidAnson/markdownlint-cli2-action@v18
+        with:
+          config: '.markdownlint.yaml'
+          globs: '**/README.md'

.markdownlint.yaml

@@ -0,0 +1,6 @@
+{
+  "MD013": false, # Line length limitation
+  "MD033": false, # Enable Inline HTML
+  "MD041": false, # Allow first line heading
+  "MD045": false, # Allow Images have no alternate text
+}