Add markdown linting to CI

.github/workflows/sdk-docs.yaml

@@ -8,6 +8,16 @@ on:
   workflow_dispatch:
 
 jobs:
+  lint:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b # tag=v3
+      - name: Setup problem matcher
+        uses: xt0rted/markdownlint-problem-matcher@v1.1.0
+      - name: Run markdownlint
+        run: npx --package markdownlint-cli markdownlint readme.md docs/**/*.md --ignore node_modules
+
   build-vitepress:
     runs-on: ubuntu-20.04
     steps:

.markdownlint.yaml

@@ -0,0 +1,16 @@
+# MD010/hard-tabs
+MD010:
+  code_blocks: false
+
+# MD013/line-length
+MD013:
+  line_length: 120
+
+# MD028/no-blanks-blockquote
+MD028: false
+
+# MD033/no-inline-html
+MD033:
+  allowed_elements:
+    - details
+    - summary