Add CodeQL workflow

.github/workflows/codeql.yml

@@ -0,0 +1,43 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ 'master', '1.6.x' ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ 'master' ]
+  schedule:
+    - cron: '1 14 * * 6'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-20.04
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'cpp', 'javascript', 'python' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v3
+      with:
+        submodules: true
+    - run: source .github/ubuntu_deps.sh
+      
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v2
+      with:
+        languages: ${{ matrix.language }}
+
+    - run: source .github/build.sh
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v2
+      with:
+        category: "/language:${{matrix.language}}"