ci: add an automated vulnerability test by Github CodeQL

Author: alvis

.github/workflows/vulnerability.yaml

@@ -0,0 +1,35 @@
+name: 'vulnerability test'
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+  schedule:
+    - cron: '0 0 * * 0'
+
+jobs:
+  codeql:
+    name: CodeQL
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: ['typescript']
+
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+
+      - name: setup CodeQL
+        uses: github/codeql-action/init@v1
+        with:
+          languages: ${{ matrix.language }}
+
+      - name: analyse
+        uses: github/codeql-action/analyze@v1