add ci for build online doc

.github/workflows/check-online-doc-build.yml

@@ -0,0 +1,30 @@
+# Copyright (C) 2024 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+name: Check Online Document Building
+permissions: {}
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build Online Document
+
+      run: |
+        git config --local --get remote.origin.url
+        ls
+        mkdir opea
+        mkdir opea/docs
+        echo "mv docs' file/folder to opea/doc"
+        mv * opea/docs
+        cd opea/docs
+        echo "build online doc"
+        bash scripts/build.sh f