Add CodeQL code scanning (preliminary config)

.github/workflows/codeql-analysis.yml

+name: "CodeQL"
+
+on:
+  push:
+    branches: [  master, develop, g-maintenance ]
+  schedule:
+    - cron: '45 7 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-18.04
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1