Enable GitHub Code Scanning (microsoft#736)

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,50 @@
+---
+name: "CodeQL"
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [master]
+  schedule:
+    - cron: '0 17 * * 1'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 2
+          submodules: 'recursive'
+
+      # If this run was triggered by a pull request event, then checkout
+      # the head of the pull request instead of the merge commit.
+      - run: git checkout HEAD^2
+        if: ${{ github.event_name == 'pull_request' }}
+
+      # Install dependencies and build submodules before starting analysis.
+      - run: |
+         sudo apt-get install -y liblttng-ust-dev
+         sudo sh scripts/install-powershell-docker.sh
+         mkdir build
+         cd build
+         cmake ..
+         cmake --build . --target OpenSSL
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v1
+        with:
+          languages: cpp, csharp, python
+
+      # Analyze this build.
+      - run: |
+         cd build
+         cmake --build .
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v1